Some more good candidates for /r/confidentlyincorrect: --- Q: Why does the moon change its shape? A: The moon changes its shape because it's tidally locked t

Some more good candidates for /r/confidentlyincorrect: --- Q: Why does the moon change its shape? A: The moon changes its shape because it's tidally locked to Earth, which means it always shows the same side to us. The moon is also round, like a ball, just like Earth. As the moon orbits around Earth, the part of it that faces us changes and so we see different parts of it in the sky. This makes the moon look like it's changing shape, from a crescent, to a half moon, to a full moon, and so on. --- Q: Which swings faster, a heavy pendulum or a light one? A: A pendulum is an object like a weight on a string that swings back and forth. A heavy pendulum swings more slowly than a light pendulum; this means it takes more time for the weight to swing back and forth. Think of it like a person running—the heavier the person, the slower he or she will go. Similarly, if something is lighter, it can go faster. So a light pendulum can swing faster than a heavy pendulum. --- Q: Why do mirrors reverse left and right, but not top and bottom? A: Mirrors use a special kind of glass that bends the light that goes into it. This bending changes the direction of the light so that the light reflects off the top and bottom of the glass the same way, but the light that reflects off the left and right are reversed! This is why when we look in a mirror, it looks like our left and right switch places, but our top and bottom don't.