You got 20 out of 25!

Even if you weren't someone who got excited about science class in school, now—as an adult—it's hard not to be amazed by science. Some science facts are so mind-boggling that they sound bogus — but they're actually completely true. Do you know that about 95 percent of all life on Earth lives in the ocean? Or the fact that Uranus is the only planet in the Solar System that spins on its side? Here's another factoid about space you may not know: it can rain diamonds on Neptune, Uranus, and Saturn! Their atmospheres have such extreme pressure that they can crystallize carbon atoms and turn them into diamonds.

In this tricky science quiz, you can expect a few easy questions and many more that will make you second-guess yourself. You might find the questions easy at the start, but don't worry, they'll get harder as you go along. This quiz will help you brush up on some fundamental science knowledge that you may have forgotten. Don't worry — no rocket science knowledge is required.