An astronaut has set a U.S. record for most time spent in space. Jeffrey Williams, commander of the International Space Station, marked his 521st day in orbit Wednesday, a number accumulated over four flights
Researchers are trying to use the sounds tigers make to help protect and boost their population in the wild. Officials are using those recordings to build a computer program to help identify specific tigers and determine more accurate population numbers.
On August 23, 1991, the World Wide Web, which had been created two years earlier by Tim Berners-Lee, a British fellow of the European Center for Nuclear Research (CERN), was made public, and in theory, accessible to all.