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How roses evolved to become the flower of Valentine’s Day

Roses are red—but their ancestors looked rather different

Axolotls can regenerate their thymus, a complex immune system organ

Axolotls can completely rebuild their thymus, a key immune organ

How often do people fall passionately in love? The answer may be less than you think

A large survey of U.S. singles reveals the different ways people experience passionate romantic love

First Proof is AI's toughest math test yet. The results are mixed

Experts gave AI 10 math problems to solve in a week. OpenAI, researchers and amateurs all gave it their best shot

Spaceflight literally moves your brain

Space's microgravity appears to shift the location of the brains of astronauts—without a clear effect on their health