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How can a car's wheels not move while the engine is running AND engaged to the transmission? Shouldn't this damage the engine? For example, if I'm using automatic transmission and I shift into drive, the transmission should be engaged, right? But the car doesn't move unless I step on the...

How does the human body know if a substance is foreign or not? And what about food? How is the immune system able to tolerate foods even though they are foreign substances?

I've always been fascinated how a clump of cells can grow, divide, and eventually become an entire animal or person with various organs and substructures. But I never managed to figure out how those initial cells managed to form organs with a definite structure instead of a blob of fleshy goo...

I've always been fascinated how a clump of cells can grow, divide, and eventually become an entire animal or person with various organs and substructures. But I never managed to figure out how those initial cells managed to form organs with a definite structure instead of a blob of fleshy goo...