Your Sense Of Touch Is Incredibly Precise
A 2013 study found that human tactile perception is sensitive enough to distinguish things on the nanoscale. Subjects were able to feel wrinkles that would have been invisible to the naked eye, some of which measured thousands of times less than the diameter of a human hair. One of the authors of the study, Mark Rutland, said, "That is one of the most enjoyable aspects of this research. We discovered that a human being can feel a bump corresponding to the size of a very large molecule."
Key Facts In This Video
The cells in the inner lens of your eye and your heart muscles have been with you for your entire life. (0:26)
Your fingers can detect a ridge that's 7,500 times smaller than the diameter of a human hair. (1:12)
Some people have more bacteria in their mouth than there are humans in the world. (2:05)