stevedextr

SOURCES: Sources: NASA and USA TODAY research

There is only one photo of Neil Armstrong walking on the moon, and in it, he has his back to the camera. The first person to step foot on another planetary body, he was not camera shy. It was just that for most of the time on the moon, he had the onl...

Bill Withers in 1971, playing "Ain't No Sunshine"

Engineering and Math

The sheer number and diversity of knots that was once in use would be bewildering to the modern city-dweller. About 4,000 different knots are described, ranging from the very simple to the extremely complex. Not so long ago, each profession or trade ...

Scientists report what they suggest is the best evidence yet that water flowed on Mars