In the video game Tetris, players try to pack as many shapes as possible into a small space. According to a new study, that’s not all they’re doing: Scientists found a connection between playing Tetris and the size of part of the brain. It sounds like a joke, but the study uses serious science. A team of three researchers from Canada and the United States scanned the brains of 15 adolescent girls, aged 12-15, who played Tetris. The scans showed that after 3 months of playing the block-stacking game, gray matter in the girls’ brains was thicker. (Gray matter is the wrinkly mixture of bra...

In the chair at the dentist’s office, nitrous oxide is better known as “laughing gas”—it’s used to knock out patients during uncomfortable procedures. That’s not the only place where laughing gas shows up, however. Nitrous oxide from Earth also ends up in the stratosphere, that portion of our atmosphere about 5 to 30 miles overhead. Up there, it’s no laughing matter. Nitrous oxide in the stratosphere is already dangerous for life on our planet, and according to a new study, it may become even more dangerous in the near future. To understand why nitrous oxide is dangerous, it�...

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