Do aliens exist? Based on how many alien invasion movies there are, you'd be forgiven that there's gotta be some proof of extraterrestrial life—and that the aliens are out to get us here on Earth. But ...

Despite being completely non-threatening to humans, the golden orb weaver spider (Plesiometa argyra) has acid-yellow spots and pincer-like legs, and is as broad as a human fist. In other words, it ...