Quick! Think of a color. Now think of a number between one and 10. What did you choose? If a common factoid is to be believed, the answer is most likely “blue” and “seven”. And we know ...

If I were a betting man, I'd bet you picked blue and seven. Not everyone makes those choices, but enough people do that it's a bona-fide psychological phenomenon. It's even got it's own name ...

Understanding the formation of blue jets — and other energetic phenomena in the stratosphere and above — can reveal clues about how lightning is triggered. Experts also believe blue jets may ...