Food for thought?

There are somewhere around 10 billion insects for every square kilometer of land surface. Think about all those lives, all those murderers and egg raiders, cooperators and queens. Here’s a hypothetical: If a pair of houseflies and all their descendants were allowed to reproduce, without attrition, for a single summer, their offspring would, according to entomologist Gilbert Waldbauer, “cover the Earth to a depth of 47 feet.