Theres been speculation that humans basically used to sleep when it got dark, which would mean theyd sleep 10, 11, even 12 hours. It turns out that thats not the case. Sreenivasan all that and more on tonights pbs newshour. Major funding for the pbs newshour has been provided by bnsf. And by the alfred p. Sloan foundation. Supporting science, technology, and improved Economic Performance and Financial Literacy in the 21st century. Support also comes from Carnegie Corporation of new york. A foundation created to do what Andrew Carnegie called real and permanent good. Celebrating 100 years of philanthropy at carnegie. Org. And with the ongoing support of these institutions this program was made possible by the corporation for public broadcasting. And by contributions to your pbs station from viewers like you. Thank you. Sreenivasan president obama announced today hell keep american troops in afghanistan through the end of his presidency, extending americas longest war. The policy reversa
Third Arab Forum on Tourism Security discusses aspects of tourism: Qatar zawya.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from zawya.com Daily Mail and Mail on Sunday newspapers.