In this episode Sam and Eric discuss the evidence that our universe began about 14 billion years ago in a very hot, dense state, then gradually expanded and cooled. As late as 1920, Einstein thought this idea was obviously nonsense. Fifty years later, it was rock-solid science.

Is the Big Bang Theory testable? After all, we can't grow a universe in a lab. How can scientists do their job in a situation where traditional experiments are impossible?

This is part 2 of our discussion comparing the scientific method to actual science.

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