Humans don't have hollow bones like birds do, so how big would our wings have to be to lift us off the ground?

Unfortunately, humans do not have either ... its 20-foot wingspan would knock it to the ground, making it difficult to simply flap the wings up and down to take off, Hedrick said.

Related: What if humans had tails? According to Habib, bat-like wings would make more sense on humans. In this setup, the entire arm and hand would stretch out, creating that 20-foot wingspan.

For the many wondrous things humans can do, we can't fly on our own. But if we could, how big would our wings be? Of course, the answer depends on the person's size. But someone who's about 155 ...