Are you a modern-day master of Science? It's time to find out with 50 questions covering astronomy, biology, chemistry, physics and more! Welcome to the ultimate science quiz! In this video, you'll ...

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, ...

See if you can still remember the science basics you learned in elementary school.

We asked 100 scientists about unsolved problems in their fields. They sent back provocations — on the origins of life, the ...