Could we have lived in a universe where time went backwards? Why do things get older rather than younger? Explore this conundrum in the video below.
Why Doesn't Time Go Backwards?
Hint: it has to do with entropy.
What Is Entropy?
Clarify one of the most puzzling ideas in science.
Key Facts In This Video
In 1865, Rudolph Clausius coined the term "entropy" and wrote the first modern form of the second law of thermodynamics. 00:50
Entropy is an emergent property—a property that arises when the whole is more than the sum of its parts. 02:05
A classic definition of entropy states that it is a measure of the "disorder" of the energy of a collection of particles. 03:06
The Big Bang Theory
Hear about how our universe began.
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