I like big bugs. I cannot lie. But which insect is the biggest? I asked my friend Rich Zack. He’s an insect scientist at Washington State University. He told me the answer depends on how you define ...

What might be mistaken for a waterslide in this image is actually the breathing tube, or trachea, of a dragonfly. This tube connects to openings in the insect's exoskeleton (outer “shell”) called ...