In high school our science teacher told us that all of our cells are replaced every 7 years.* If this is true, why do I still have my tattoo?
The continued presence of moles and birthmarks I understand because they are genetically coded to be there but I didn’t even get inked until I was 24. That was 12 years ago and the tatts are still here.
What’s the Straight Dope?
- Not all at once, gradually. Though a one-time “ZAP! You’re new!” would be cool.