When author Malcolm Gladwell proposed that practising a certain task for around 10,000 hours can lead to success, he gave hope wannabe Bill Gateses and Tiger Woodses, and dashed the dreams of millions of slackers.
Facebook Inc's mobile advertising revenue growth gained momentum in the first three months of the year as the social network sold more ads to users on smartphones and tablets, partially offsetting higher spending which weighed on profits.
If life ever existed on Mars, scientists expect that it would be small simple life forms called microbes. Mars likely never had enough oxygen in its atmosphere and elsewhere to support more complex organisms. Thus, large fossils are not likely.