Science has permitted humans to do some incredible things, like landing on the Moon, and uncovering why rain falls from the sky. But when it comes to some other things, like hiccups and tornadoes, scientists still can’t quite figure out the reason behind them. And while they may have theories about the following phenomena, no one can say for certain why they occur.
Want to discover what they are? Then check out this gallery for common things that are still a mystery to scientists.