New findings suggest fingerprints and sweat work together in "fight or flight" survival responses.
Traditional microscopes make it look like sperm tails undulate symmetrically -- but that's an optical illusion.
Study attributes age-related hearing loss to hair cells -- the same sense organs that are damaged by loud noises.
Oxygen-sensing genes allow cells to adapt when oxygen levels drop.
Different people respond to cannabis in different ways, making a blood THC level difficult to legislate.
Polio peaks in the summer, measles during the school year, and chickenpox in the spring.