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Cretaceous-paleogene extinction

Cretaceous-Paleogene Boundary (65 Million Years Ago) ... A rendering of an ocean scene as it may have looked 65 million years ago,. This rendering shows life at ...A mass extinction on Earth is long overdue, according to population ecologists. Find out why a mass extinction is overdue and learn about human extinction. Advertisement Do you ever walk around with the vague feeling that you're going to di...The Cretaceous–Paleogene (K–Pg) extinction event, also known as the Cretaceous–Tertiary (K–T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 66 million years ago. With the exception of some ectothermic species like the ... Oct 18, 2023 · The Cretaceous ended with one of the greatest mass extinctions in the history of Earth, exterminating the dinosaurs, marine and flying reptiles, and many marine invertebrates. The Cretaceous environment Paleogeography. The position of Earth’s landmasses changed significantly during the Cretaceous Period—not unexpected, given its long duration. Cretaceous-Paleogene Boundary (65 Million Years Ago) ... A rendering of an ocean scene as it may have looked 65 million years ago,. This rendering shows life at ...Growing to an estimated length of 17 m (56 ft.), Mosasaurus was one of the largest-known mosasaurs. It lived right at the end of the Cretaceous Period, and became extinct along with the non-avian dinosaurs in the Cretaceous-Paleogene extinction event. Mosasaurus swam using undulations of its body, aided by its powerful tail.The Cretaceous–Paleogene (K/Pg) extinction appears to have been geographically heterogeneous for some organismal groups.The extinction event at the Cretaceous–Paleogene boundary (KPB, 66 million years before present) was the most recent mass extinction with an estimated 70% species loss . Similar to other mass extinctions it was associated with a profound disruption of the global carbon cycle ( 6 ).Artist's depiction of the end-Cretaceous impact eventSince the 19th century, a significant amount of research has been conducted on the Cretaceous-Paleogene extinction event, the mass extinction that ended the dinosaur-dominated Mesozoic Era and set the stage for the Age of Mammals, or Cenozoic Era.A chronology of this research is presented here.The Chicxulub crater is the site of an asteroid impact linked with the Cretaceous-Paleogene (K-Pg) mass extinction at ∼66 Ma. This asteroid struck in shallow water and caused a large tsunami. Here we present the first global simulation of the Chicxulub impact tsunami from initial contact of the projectile to global propagation.Encyclopædia Britannica, Inc. The Cretaceous Period was the last of three geologic time periods in the Mesozoic Era.The Cretaceous began approximately 145 million years ago at the end of the Jurassic Period and ended about 66 million years ago. The Cretaceous was succeeded by the Paleogene Period of the Cenozoic Era.The Cretaceous is perhaps …Jan 25, 2022 · The dinosaurs were killed by a meteorite impact on the Earth some 66 million years ago in what has become known as the Cretaceous-Paleogene extinction event.At what time of the year this occurred ... The Cretaceous/Paleogene mass extinction, 66 Ma, included the demise of non-avian dinosaurs. Intense debate has focused on the relative roles of Deccan volcanism and the Chicxulub asteroid impact as kill mechanisms for this event. Jul 8, 2022 · The end of the Cretaceous is the second largest mass-extinction, behind only the extinction at the end of the Permian. Although there is some discussion about certain groups being on their way out near the end of the Cretaceous, or perhaps even going extinct some hundreds of thousands or tens of thousands of years before the end, this kind of thing is hard to tell with the level of accuracy ... GEOL 104 The Cretaceous-Paleogene Extinction: All Good Things... •The disappearance of non-avian dinosaurs was just one part of a larger event: the Cretaceous-Paleogene (K/Pg) mass extinction (formerly called the Cretaceous-Tertiary or K/T extinction). •Diverse groups of land and sea organisms died out at this time, 66.05 million years ago.A mass extinction on Earth is long overdue, according to population ecologists. Find out why a mass extinction is overdue and learn about human extinction. Advertisement Do you ever walk around with the vague feeling that you're going to di...The extinction event at the Cretaceous–Paleogene boundary (KPB, 66 million years before present) was the most recent mass extinction with an estimated 70% species loss . Similar to other mass extinctions it was associated with a profound disruption of the global carbon cycle ( 6 ).It comes after the Jurassic Period and before the Paleogene - the first period of the Cenozoic Era, our current era. It lasted a long time, nearly 80 million years, making it the longest geological period of the Phanerozoic Eon, which began some 539 million years ago. The Cretaceous is split into two smaller time periods called epochs.After the Cretaceous–Paleogene extinction event wiped out the non-avian dinosaurs (birds are generally regarded as the surviving dinosaurs) and several other mammalian groups, placental and marsupial mammals diversified into many new forms and ecological niches throughout the Paleogene and Neogene, by the end of which all modern orders had ...For an extinction event to be considered as a major extinction event, at least half of all the life forms existing during that period under review must be wiped out. The five major mass extinction events are the Ordovician-Silurian, Late Devonian, Permian-Triassic, Triassic-Jurassic, and Cretaceous-Paleogene extinction events.hace 4 días ... Dinosaurs ruled the world for roughly 140 million years—until they suddenly disappeared. While decades of research point to an asteroid ...Learn about the mass extinction event 66 million years ago and the evidence for what ended the age of the dinosaurs. ... At that point, as the Cretaceous period yielded to the Paleogene, it seems ...7 oct 2012 ... Five major mass extinction events punctuate the history of animal life on earth. Of these, the Cretaceous–Paleogene (K–Pg) extinction is the ...Cretaceous-Paleogene extinction - 66 million years ago. The Cretaceous-Paleogene extinction event is the most recent mass extinction and the only one definitively connected to a major...They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 million years ago; their dominance continued throughout the Jurassic and Cretaceous periods. ... and are the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event approximately 66 million years ago. Dinosaurs can ...Question: Even at the most famous of Mass Extinctions, the Cretaceous - Paleogene extinction, there were likely multiple independent stressors that amplified the level of extinction. Read about the end-Cretaceous in your textbook (p. 502-504) and select all that occurred here. Supercontinent Pangaea Asteroid impact Flood basalt volcanism O Gamma-ray burst Sea-levelFeb 23, 2022 · The Cretaceous–Palaeogene mass extinction around 66 million years ago was triggered by the Chicxulub asteroid impact on the present-day Yucatán Peninsula 1, 2. This event caused the highly ... The third spurt Grossnickle referred to was the Cretaceous–Paleogene mass extinction of non‐avian dinosaurs 66 million years ago. “This third diversification event was the most profound, resulting in the incredible diversity of mammals that are on Earth today”, Grossnickle said.The asteroid strike triggered the Cretaceous-Paleogene, or K-Pg, mass extinction. ... Had the impact occurred elsewhere, or in a place of deeper ocean water, the extinction may have happened ...Jun 29, 2020 · What is the Cretaceous-Paleogene extinction event? It’s the sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago. The only ... Earlier this year, Bermúdez visited outcrops of the infamous Cretaceous-Paleogene (K-Pg) mass extinction event boundary in Texas, Alabama, and Mississippi to collect data, supplementing his ...The Cretaceous–Paleogene extinction event, also known as the Cretaceous–Tertiary extinction, was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs. Most other tetrapods weighing more than 25 kilograms also became extinct, with the exception of some ectothermic ...Aug 1, 2016 · Abrupt and short-lived “impact winter” conditions have commonly been implicated as the main mechanism leading to the mass extinction at the Cretaceous-Paleogene (K-Pg) boundary (ca. 66 Ma), marking the end of the reign of the non-avian dinosaurs. However, so far only limited evidence has been available for such a climatic perturbation. 13 sept 2019 ... Correlated terrestrial and marine evidence for global climate changes before mass extinction at the cretaceous-Paleogene boundary. Proc Natl ...A mass extinction occurred at the Cretaceous−Paleogene boundary coincident with the impact of a 10-km asteroid in the Yucatán peninsula. A worldwide layer of soot found at the boundary is consistent with global fires.The Cretaceous-Tertiary extinction event, or the K-T event, is the name given to the die-off of the dinosaurs that took place some 65.5 million years ago. For many years, paleontologists believed ...The Chicxulub crater is the site of an asteroid impact linked with the Cretaceous-Paleogene (K-Pg) mass extinction at ∼66 Ma. This asteroid struck in shallow water and caused a large tsunami. Here we present the first global simulation of the Chicxulub impact tsunami from initial contact of the projectile to global propagation.Sep 14, 2021 · The Cretaceous-Paleogene (K-Pg) mass extinction caused the demise of numerous vertebrate groups, and its aftermath saw the rapid diversification of surviving mammals, birds, frogs, and teleost fishes. The most famous of all the mass extinction events is the Cretaceous-Paleogene extinction — better known as the day the dinosaurs died. The event is sometimes also known as the K-T extinction, ...The extinction event at the Cretaceous–Paleogene boundary (KPB, 66 million years before present) was the most recent mass extinction with an estimated 70% species loss . Similar to other mass extinctions it was associated with a profound disruption of the global carbon cycle ( 6 ).The end of the Cretaceous is the second largest mass-extinction, behind only the extinction at the end of the Permian. Although there is some discussion about certain groups being on their way out near the end of the Cretaceous, or perhaps even going extinct some hundreds of thousands or tens of thousands of years before the end, this kind of thing is hard to tell with the level of accuracy ...The Cretaceous/Paleogene mass extinction, 66 Ma, included the demise of non-avian dinosaurs. Intense debate has focused on the relative roles of Deccan volcanism and the Chicxulub asteroid impact as kill mechanisms for this event. Learn about the mass extinction event 66 million years ago and the evidence for what ended the age of the dinosaurs. ... At that point, as the Cretaceous period yielded to the Paleogene, it seems ...The Cretaceous–Paleogene (K–Pg) extinction event, also known as the Cretaceous–Tertiary (K–T) extinction,[lower-alpha 2] was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago. With the exception of some ectothermic species such as the sea turtles and crocodilians, no tetrapods weighing more than 25 kilograms (55 ...4 mar 2010 ... ... Cretaceous-Paleogene extinction, scientists conclude in a new, deep review ... extinct after the Cretaceous. And from the work he and his ...Best known for killing off the dinosaurs, the end-Cretaceous mass extinction also caused many other casualties.Ammonoids (marine mollusks), pterosaurs (gliding reptiles), mosasaurs (swimming reptiles), …The effect of the Cretaceous-Paleogene (K-Pg) (formerly Cretaceous–Tertiary, K–T) mass extinction on avian evolution is debated, primarily because of the poor fossil record of Late Cretaceous birds. In particular, it remains unclear whether archaic birds became extinct gradually over the course of the Cretaceous or whether they remained ...Biology. Biology questions and answers. During the Cretaceous - Paleogene extinction event, a huge impact kicked up dust that blocked out the sun for a long time. Before this time, the earth was dominated mostly by plants and reptiles, although fungi and mammals were also present. After this event, fungi began to dominate the landscape.Nov 1, 2014 · The distribution of major Paleogene vegetation types was also discussed by Macrofloristic diversity remained low in some North American ecosystems for several million years following the end-Cretaceous event and did not reach end-Cretaceous values until the Eocene (Johnson and Ellis, 2002, Barclay et al., 2003, Barclay and Johnson, 2004, Peppe ... They prefer to dismiss the term Tertiary and replace it with the term Paleogene. Thus, you will sometimes read about the K-Pg mass extinction event. A diagram ...11 dic 2019 ... ... Cretaceous-Paleogene mass extinction event. The researchers found that — in the run-up to the extinction event — the shells' chemistry ...The End of the Dinosaurs: The K-T extinction. Almost all the large vertebrates on Earth, on land, at sea, and in the air (all dinosaurs, plesiosaurs, mosasaurs, and pterosaurs) suddenly became extinct about 65 Ma, at the end of the Cretaceous Period. At the same time, most plankton and many tropical invertebrates, especially reef-dwellers ... The Cretaceous-Paleogene extinction, or K/Pg event, wiped out an estimated 75% of the species on the planet at the time. When the impact came, and the subsequent fires and clouds of particulate ...

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Aquilolamna is an extinct genus of shark -like elasmobranch from the Late Cretaceous ( Turonian )-aged Agua Nueva Formation of Mexico. It is currently known to contain only one species, A. milarcae, also known as the eagle shark, and it is classified in its own family Aquilolamnidae, which has been tentatively assigned to the mackerel sharks.The Cretaceous-Paleogene extinction event was an extinction event that occured approximately 66 million years ago, ending the Mesozoic era. The most well-known victims of the event are the dinosaurs, along with pterosaurs and marine reptiles. The most widely accepted theory is that a massive meteor hit earth. This meteor was 10km wide, and weighed about 20,000 tonnes. When it smashed into the ...The End of the Dinosaurs: The K-T extinction. Almost all the large vertebrates on Earth, on land, at sea, and in the air (all dinosaurs, plesiosaurs, mosasaurs, and pterosaurs) suddenly became extinct about 65 Ma, at the end of the Cretaceous Period. At the same time, most plankton and many tropical invertebrates, especially reef-dwellers ... Jun 27, 2023 · The catastrophic destruction triggered by the asteroid hitting the Earth resulted in the death of all non-avian dinosaurs in an event termed the Cretaceous-Paleogene (K-Pg) mass extinction.Debate ... The Cretaceous–Paleogene (K–Pg) boundary mass extinction was one of the most devastating events in the Phanerozoic history of life, both on land and in the oceans (1, 2). It is widely acknowledged to be related to the impact of an asteroid with an estimated diameter of ∼10 km at Chicxulub, Yucatan Peninsula, Mexico ( 3 – 6 ).Since 1980, more than 2000 papers and books have dealt with some aspect of a mass extinction at the Cretaceous-Tertiary (K/T) boundary. One authoritative estimate of the severity of the extinctions is that 60-80% of all the living species became extinct at this boundary (Raup 1988). Majungasaurus is a genus of abelisaurid theropod dinosaur that lived in Madagascar from 70 to 66 million years ago, at the end of the Cretaceous Period, making it one of the last known non-avian dinosaurs that went extinct during the Cretaceous–Paleogene extinction event. The genus contains a single species, Majungasaurus crenatissimus. This dinosaur is also called …Recently, Freeling 158 proposed an interesting alternative hypothesis about how polyploid plants might be able to survive periods of mass extinction (Fig. 1; Cretaceous–Paleogene boundary).The Cretaceous-Paleogene boundary approximately 65.5 million years ago marks one of the three largest mass extinctions in the past 500 million years. The extinction event coincided with a large asteroid impact at Chicxulub, Mexico, and occurred within the time of Deccan flood basalt volcanism in Ind …Cambrian explosion, the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period.The event was characterized by the appearance of many of the major phyla (between 20 and 35) that make up modern animal life. Many other phyla also evolved during this …The five mass extinctions in Earth’s history occurred at or near the end of the Ordovician, Devonian, Permian, Triassic and Cretaceous periods. The Ordovician extinction occurred in two phases, destroying 60 to 70 percent of all species.Aug 24, 2014 · The Cretaceous/Palaeogene (K/Pg) event precipitated an 80–95% species-level extinction of calcareous nannoplankton (primary producers) and planktonic foraminifera (primary consumers), decimating ... ....

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"Despite its discovery in France, in Mont de Berru (Marne), this Laurasian taxon is not recognized as a member of a European clade that survived the Cretaceous-Paleogene extinction event.The Cretaceous-Paleogene extinction that wiped out the nonavian dinosaurs 66 million years ago was correlated with two extreme events: The Chicxulub impact occurred at roughly the same time that massive amounts of lava were erupting from the Deccan Traps (see the Perspective by Burgess). Sprain et al. used argon-argon dating of the volcanic ash ...Mar 30, 2019 · The Cretaceous–Paleogene (K–Pg) extinction event, was a sudden mass extinction of some three-quarters of the plant and animal species on Earth, approximately 66 million years ago. With the exception of some ectothermic species such as the leatherback sea turtle and crocodiles, no tetrapods weighing more than 25 kilograms (55 lb) survived. Despite its discovery in France, in Mont de Berru (Marne), this Laurasian taxon is not recognized as a member of a European clade that survived the Cretaceous-Paleogene extinction event.Keith R. Skene. Environment, Development and Sustainability (2021) The mass extinction of life 66 million years ago at the Cretaceous/Paleogene boundary, …The Cretaceous/Paleogene (K/Pg) boundary mass extinction, which occurred 66 million years ago, is the most recent and arguably the most famous of the big 5 mass extinctions which have taken place ...Jan 17, 2020 · Abstract. The cause of the end-Cretaceous mass extinction is vigorously debated, owing to the occurrence of a very large bolide impact and flood basalt volcanism near the boundary. Disentangling their relative importance is complicated by uncertainty regarding kill mechanisms and the relative timing of volcanogenic outgassing, impact, and ... Nature Communications - Debate surrounds the causes, timing, and effects of the Cretaceous-Paleogene mass extinction, 66 Ma. Here, using new collections of marine macrofossils from Seymour...The most recent and best-known, the Cretaceous–Paleogene extinction event, which occurred approximately 66 Ma (million years ago), was a large-scale mass extinction of animal and plant species in a geologically short period of time.Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 68 to 66 million years ago. It was the last known member of the tyrannosaurids, and among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction.Earlier this year, Bermúdez visited outcrops of the infamous Cretaceous-Paleogene (K-Pg) mass extinction event boundary in Texas, Alabama, and Mississippi to collect data, supplementing his ......

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The Cretaceous-Paleogene boundary (KPB) mass extinction (~ 66.02 Ma) and the Paleocene-Eocene Thermal Maximum (PETM) (~ 55.8 Ma) are two remarkable climatic and faunal events in Earth's history that have implications for the current Anthropocene global warming and rapid diversity loss.The Cretaceous/Paleogene mass extinction, 66 Ma, included the demise of non-avian dinosaurs. Intense debate has focused on the relative roles of Deccan volcanism and the Chicxulub asteroid impact as kill mechanisms for this event. Paleogene Period, also spelled Palaeogene Period, oldest of the three stratigraphic divisions of the Cenozoic Era spanning the interval between 66 million and 23 million years ago. Paleogene is Greek meaning “ancient-born” and includes the Paleocene (Palaeocene) Epoch (66 million to 56 million years ago), the Eocene Epoch (56 million to 33.9 million years ago), and the Oligocene …The end of the Cretaceous is a dramatic period in the Earth's history, when a catastrophic event known as the Cretaceous-Paleogene mass extinction event took place (66.043 ± 0.011 Ma). During the early Danian a minor hyperthermal event, known as Dan-C2 event, was raised and caused a minor perturbation in the carbon cycle.Cretaceous-Paleogene extinction - 66 million years ago. The Cretaceous-Paleogene extinction event is the most recent mass extinction and the only one definitively connected to a major...Cambrian explosion, the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period.The event was characterized by the appearance of many of the major phyla (between 20 and 35) that make up modern animal life. Many other phyla also evolved during this …Paleogene Period, also spelled Palaeogene Period, oldest of the three stratigraphic divisions of the Cenozoic Era spanning the interval between 66 million and 23 million years ago. Paleogene is Greek meaning “ancient-born” and includes the Paleocene (Palaeocene) Epoch (66 million to 56 million years ago), the Eocene Epoch (56 million to 33.9 million years ago), and the Oligocene …After the massive extinction at the end of the Cretaceous, evolution once again proceeded rapidly. With their dinosaur competitors gone, many new mammals evolved. The first rodents, armadillos, primitive primates, and ancestors to modern mammalian carnivores appeared. However, none of these Paleocene forms were any bigger than a small bear.The most recent and best-known, the Cretaceous–Paleogene extinction event, which occurred approximately 66 Ma (million years ago), was a large-scale mass extinction of animal and plant species in a geologically short period of time.Pachycephalosaurus was among the last species of non-avian dinosaurs on Earth before the Cretaceous–Paleogene extinction event. The genus Tylosteus has been synonymized with Pachycephalosaurus, as have the genera Stygimoloch and Dracorex, in recent studies.4 mar 2010 ... ... Cretaceous-Paleogene extinction, scientists conclude in a new, deep review ... extinct after the Cretaceous. And from the work he and his ...Fall Semester 2019Cretaceous/Paleogene Extinction. Detail from "Dead T. rex " by Douglas Henderson (1999) Key Points: •Modern animals are often characterized as "warm-blooded" (mammals, birds) and "cold-blooded" (everything else) •This is a simplification of several related phenomena: energy source (endothermy vs. ectothermy); metabolic ...The Cretaceous/Paleogene mass extinction, 66 Ma, included the demise of non-avian dinosaurs. Intense debate has focused on the relative roles of Deccan volcanism and the Chicxulub asteroid impact as kill mechanisms for this event. Here, we combine fossil-occurrence data with paleoclimate and habitat suitability models to evaluate dinosaur ...The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth. Prior to 2013, it was commonly cited as having happened about 65 million years ago, but Renne and colleagues (2013) gave an ... ...

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By the time the Cretaceous-Paleogene, or K-Pg, extinction event was over, about three-quarters of species alive at the time of impact had disappeared forever. Advertisement.Jan 26, 2022 · The Dinosaurs Probably Met Their Demise in June. . The dinosaurs were killed by a meteorite impact on the Earth some 66 million years ago in what has become known as the Cretaceous-Paleogene extinction event. At what time of the year this occurred has long generated debate among palaeontology enthusiasts. A recent study published in Nature ... The boundary is defined by a global extinction event that caused the abrupt demise of the majority of life on Earth. It has been dated to 65 million years ago, coeval with the age of the 200-kilometer-diameter Chicxulub impact structure in Mexico. Cretaceous–Paleogene (K–Pg) boundary, formerly known as the Cretaceous–Tertiary (K–T ...Additional resources. The Cretaceous period was the last and longest segment of the Mesozoic era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic ...Fossils are found in a variety of rock formations dating to the Maastrichtian age of the Upper Cretaceous period, 68 to 66 million years ago. It was the last known member of the tyrannosaurids and among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.Tertiary is an obsolete term for the geologic period from 66 million to 2.6 million years ago. The period began with the demise of the non-avian dinosaurs in the Cretaceous–Paleogene extinction event, at the start of the Cenozoic Era, and extended to the beginning of the Quaternary glaciation at the end of the Pliocene Epoch. The time span covered by the Tertiary …The Cretaceous–Paleogene extinction event, also known as the K–Pg extinction event, was a mass extinction event that occurred about 66 million years ago. It is ...For an extinction event to be considered as a major extinction event, at least half of all the life forms existing during that period under review must be wiped out. The five major mass extinction events are the Ordovician-Silurian, Late Devonian, Permian-Triassic, Triassic-Jurassic, and Cretaceous-Paleogene extinction events.The most famous of all the mass extinction events is the Cretaceous-Paleogene extinction — better known as the day the dinosaurs died. The event is sometimes also known as the K-T extinction, ...Feb 22, 2019 · The Cretaceous-Paleogene extinction that wiped out the nonavian dinosaurs 66 million years ago was correlated with two extreme events: The Chicxulub impact occurred at roughly the same time that massive amounts of lava were erupting from the Deccan Traps (see the Perspective by Burgess). Sprain et al. used argon-argon dating of the volcanic ash ... Aug 1, 2016 · Abrupt and short-lived “impact winter” conditions have commonly been implicated as the main mechanism leading to the mass extinction at the Cretaceous-Paleogene (K-Pg) boundary (ca. 66 Ma), marking the end of the reign of the non-avian dinosaurs. However, so far only limited evidence has been available for such a climatic perturbation. or...

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