You don't even need to comb your hair to leave DNA all over the place. A normal person will lose 50-100 hairs every day.[0]
Also, everyone sheds dead skill cells, and certain dermatological conditions can exacerbate matters.
[0] http://www.aad.org/dermatology-a-to-z/diseases-and-treatment...
True. If you're in an office you haven't visited before and would like to be disgusted, examine the bottoms of a few mice.
You don't even need to comb your hair to leave DNA all over the place. A normal person will lose 50-100 hairs every day.[0]
Also, everyone sheds dead skill cells, and certain dermatological conditions can exacerbate matters.
[0] http://www.aad.org/dermatology-a-to-z/diseases-and-treatment...