SciShow host Hank Green explores how human hair knows when to stop growing in a recent episode. As Green notes, the actual process is still being debated, but it is currently believed that hair receives chemical growth signals to determine this.
SciShow host Hank Green explores how human hair knows when to stop growing in a recent episode. As Green notes, the actual process is still being debated, but it is currently believed that hair receives chemical growth signals to determine this.