[brent13a]

Other studies point to radio signals from cell phone towers.

I've heard this before and I've always wondered (briefly that is) how radio waves can affect something that depends on chemical markers to communicate and direct themselves.
Of course I've never wondered about it enough to research the work on it though.

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Here's a short but sweet article, but there are others if you decide to search.

However, I wouldn't be surprised to hear that pesticides are bad for bees as well.