We asked 100 scientists about unsolved problems in their fields. They sent back provocations — on the origins of life, the possibilities for human progress and much more.

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Bill Nye uses the power of Twitter to once again answer common questions about science. When will teleportation happen? Will tardigrades take over the moon? How do planes work? What does a neutron do?

years ago in a cave near Les Eyzies in the Dordogne, France. Credit: SEARCHING: Our Quest for Meaning in the Age of Science Dr. Alan Lightman has been around the block a few times. Over the past five ...

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, ...

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 ...