There are few simple answers in science. Even seemingly straightforward questions, when probed by people in search of proof, lead to more questions. Those questions lead to nuances, layers of ...

Add Yahoo as a preferred source to see more of our stories on Google. If you had a reputation for being a know-it-all as a kid, you're likely now the person with a trusted list of trivia questions and ...

1. Question: At what temperature are Celsius and Fahrenheit equal? Answer: -40 degrees. 103. Question: How many planets can be seen from Earth without a telescope? Answer: Five (Mercury, Venus, Mars, ...