9 phenomena that science still can't explain

• There's a lot that we don't know much about our universe and many mysteries scientists can't explain.
• Scientists still aren't sure why people yawn, for example, or why one type of mushroom only grows in two places on Earth: Texas and Japan.
• Below are some of the most confounding mysteries scientists are working to solve.

Humans have traveled to the moon and uncovered the secrets of the Taos Hum, the Devil's Kettle, and maybe even the pyramids of Egypt. But there are still plenty of phenomena that science can't explain yet.

Though scientists may have theories about the following phenomena, no one can say for certain why they occur and in many cases.

Here are nine mysteries of life that still stump experts everywhere.