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CO2 emissions and climate change 
Global warming is the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation. The global average air temperature near the Earth's surface rose 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 year period ending in 2005.[1] The Intergovernmental Panel on Climate Change (IPCC) concludes "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations"[1] via the greenhouse effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward.[2][3] These basic conclusions have been endorsed by at least 30 scientific societies and academies of science,[4] including all of the national academies of science of the major industrialized countries.[5][6][7] While individual scientists have voiced disagreement with the conclusions of the IPCC[8], the overwhelming majority of scientists working on climate change are in agreement with the conclusions.
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Added By - publichealth
Subject - Public Health
Document Type - Discussion
Video Duration - 00:01:55


How Mercury Kills the Brain - Autism 
Autism is a brain development disorder that impairs social interaction and communication, and causes restricted and repetitive behavior, all starting before a child is three years old. This set of signs distinguishes autism from milder autism spectrum disorders (ASD) such as Asperger syndrome.

Autism is largely inherited, although the genetics of autism are complex and it is generally unclear which genes are responsible.[1] In rare cases, autism is strongly associated with agents that cause birth defects.[2] Other proposed causes, such as childhood vaccines, are controversial and the vaccine hypotheses lack convincing scientific evidence.[3] Most recent reviews estimate a prevalence of one to two cases per 1,000 people for autism, and about six per 1,000 for ASD, with ASD averaging a 4.3:1 male-to-female ratio. The number of people known to have autism has increased dramatically since the 1980s, at least partly due to changes in diagnostic practice; the question of whether prevalence has increased is unresolved.[4]

Autism affects many parts of the brain; how this occurs is poorly understood. Parents usually notice signs in the first year or two of their child's life. Early intervention may help childr...
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Added By - 123
Subject - Cognitive Science
Document Type - Documentary
Video Duration - 00:00:02


Terry Tao Fields Medal In Math 

Terence Chi-Shen Tao (陶哲軒) (born 17 July 1975, Adelaide, South Australia) is an Australian mathematician working primarily on harmonic analysis, partial differential equations, combinatorics, analytic number theory and representation theory.

A child prodigy, Tao is currently a professor of mathematics at UCLA. He was promoted to a full professor at age 24. In August 2006, he was awarded the Fields Medal. Just one month later, in September 2006, he was awarded a MacArthur Fellowship. He was elected a Fellow of the Royal Society on 18 May 2007.

Tao exhibited extraordinary mathematical abilities from an early age, attending university level mathematics courses at the age of nine. He is one of only two children in the history of the Johns Hopkins' Study of Exceptional Talent program to have achieved a score of 700 or greater on the SAT math section while just 8 years old (he scored a 760). In 1986, 1987, and 1988, Tao was the youngest participant to date in the International Mathematical Olympiad, first competing at the age of ten, winning a bronze, silver, and gold medal respectively. He won the gold medal when he just turned thirteen and remains the youngest gold medallis...

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Added By - 123456
Subject - Mathematics
Document Type - Profile
Video Duration - 00:00:02


Pharaoh Tutankhamen 
Archaeologist Howard Carter discovers Tutankhamen's tomb in the 20th century, revealing incredible treasure and more knowledge of Ancient Egypt. The mystery of why his tomb remained hidden is revealed, suggesting Tut was murdered and secretly buried.In historical terms, Tutankhamun is of only moderate significance, and most of his modern popularity stems from the fact that his tomb in the Valley of the Kings was discovered almost completely intact. However, he also is significant as a figure among those who managed the beginning of the transition from the heretical Atenism of his predecessors Akhenaten and perhaps Smenkhkare back to the familiar Egyptian religion. As Tutankhamun began his reign at age nine, his vizier and eventual successor Ay was probably making most of the important political decisions during Tutankhamun's reign. Nonetheless, Tutankhamun is, in modern times, one of the most famous of the pharaohs, and the only one to have a nickname in popular culture ("King Tut"). The 1922 discovery by Howard Carter of Tutankhamun's nearly intact tomb (subsequently designated KV62) received worldwide press coverage and sparked a renewed public interest in ancient Egypt, for which Tutankhamun remains the popular face.T...
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Added By - 123456
Subject - History
Document Type - Documentary
Video Duration - 00:00:02

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