Harvard researchers have been working on their robot bee for a really, really long time (in robot years). It's impressively small, being bee-sized, but it turns out that it's so small that it's not realistic to expect it to fly with onboard power and computing in the near future. Plus, the flight dynamics of tiny insects like bees is significantly different from larger insects like butterflies and moths, which exhibit combinations of flapping, gliding, and soaring flight. To explore this, Harvard researchers have developed FWMAV, a novel insect-scale flapping-wing micro-air vehicle that's just small enough to be called "micro" and just big enough to operate completely untethered.