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Hook

Their other posts in the index, biggest breakout first.
In Antarctica, you're never allowed to pee on the ice. Not even when you're hiking for hours. It's so cold and so dry there that when it snows, it basically never melts. It just stacks up into layers and layers of ice, trapping air inside. Scientists then drill ice cores to study that air, going back hundreds of thousands of years to learn what the environment was like. But anything else that hits that ice like ash from volcanic eruptions gets trapped too. So if you pee, one day some descendant of yours would be drilling an ice core in Antarctica and they pull it out and say, what's that yellow line?