A mosquito's sting has six needles, not just one, to help females suck your blood, killing hundreds of thousands of people each year by spreading infection. Sharp blades to cut through the skin top two needles; another two hold the wound apart to let a "straw" in to suck up the blood and a sixth acts as a holster to keep its lethal sting safe. Think about this engineering next time you are tempted to smash a mosquito on your skin.

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