The components of a PARITy differential, with a penny for scale
Micro Air Vehicles (MAVs) are in development at various research institutes and aerospace firms worldwide, with an eye toward someday being used in applications such as search and rescue operations, environmental monitoring, or exploration of hazardous environments... or spying, as seems to be the case with all things micro. Like insects, many of these MAVs fly by flapping a set of wings, so they need to be designed to cope with crosswinds or potential wing damage. Engineers at Harvard University have created a tiny automobile-style differential, to keep the two wings generating the same amount of torque. The device is literally one one-millionth the size of what you’d find in your car.