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If a bee dies, is its stinger still active?

I heard that if a bee dies, its stinger is still active. Is that true? asks reader Tim Younquist.

Luckily for us, most bees have a live-and-let-live attitude. It takes a lot to provoke the average bee, like stepping on a worker bee on a blade of grass, or — especially — threatening her home. [...]

How come flies don’t fall off the ceiling?

How come flies don’t fall off the ceiling? asks reader J. Jones.

If we could look closely at our ceilings, we’d see the crisscrossing paths of thousands of tiny footprints, left by flies, ladybugs, and other insects (as well as by spiders). In fact, the problem for flies and other bugs may not be holding [...]