Though we know them to be dirty insects, cockroaches are actually incredible self-groomers. In fact, their grooming behavior ...

Artist's rendering of the Chicxulub asteroid entering Earth's atmosphere 66 million years ago, triggering events that caused a mass extermination. Roger Harris/Science Photo library via Getty Images ...

There is a particular kind of moment that triggers it. The light comes on. Something moves along the wall or across the floor ...