Bed bugs have tormented humans for millennia, so detested that their mere mention can make hearts race and arms itch. There are approximately 100 species of bed bugs, but thankfully only three of them feed on humans. So, why are these unwelcome houseguests so difficult to defeat? And is there any way to get rid of them for good?

Dig into how bed bugs establish a colony in your home, and find out what makes it so hard to prevent these itchy invasions.

[TED Ed]