Here’s an observation: Using nail clippers to clip one’s nails. Now, I highly doubt that man figured out nail clippers prior to the iron age, but it really does not make sense to use stone to smash one’s own fingers. This allowed me to come to two possible conclusions:
1. Nails naturally wear out under heavy use, so no nail clippers are necessary.
2. We trim our nails by biting ’em.
Based on how often movies like to portray humans in castaway situations as biting their nails, I suspect it is #2. Therefore, why do we punish nail biters if it’s not disgusting, but rather, normal?