Facts and facts and facts, oh my! If you've long subscribed to the 10,000-hour rule, which claims that to master a skill you need to spend 10,000 hours practicing it, 2019 may have dealt you a pretty swift blow. A new study concluded that it takes a lot more than practice to make perfect.

From pop culture to space, math to literature, and everything in between, 2019 was a year full of amazing discoveries. In this edition of "The List Show," Mental Floss editor-in-chief Erin McCarthy is sharing 100 of the most interesting facts we've learned over the past 12 months.

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