29 Humans only have five senses.

Many of us were taught that humans have five senses: touch, taste, smell, sight, and hearing. But those are only the five basic senses. While this concept of the "five" senses originated with Aristotle, many scientists argue that humans actually have between 14 and 20 senses.

30 Shaving your hair makes it grow back thicker.

Shaving your hair doesn't make it change in color, rate of growth, or thickness, says the Mayo Clinic. All it does is give the hair a blunt tip, which might feel more coarse as it grows out.