Misconceptions about beverages are everywhere. Is bottled water better for you than tap water? Does drinking diet pop make you gain (or lose) weight? And, of course, will eating Pop Rocks before drinking pop kill you? Mental Floss runs through those and several other misconceptions in a new video.

Andreas Wahl appears to enjoy putting his life at risk. But the Norwegian physicist knows that firing a gun at himself under water, sliding down a flaming ramp and falling 40 feet while attached to a rope won’t really kill him because he understands physics. His videos are scary but enlightening.

Don’t take medicine with grapefruit juice. Seriously. It’s the weirdest drug warning we’ve heard, but it’s real. SciShow explains why that citrus and not others (say, orange juice) can mess with you.

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