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 pounds ...
FRUIT FLIES are smart. For a start—the clue is in the name—they can fly. They can also flirt; fight; form complex, long-term memories of their surroundings; and even warn one another about the ...