I periodically see my doctor and our conversations go like this...

Doc: your diet isn't great. Don't you think you should try to easy off on the salt?

Me: Na

Doc: you really should. You might develop respiratory issues and have trouble breathing.

Me: O

Doc: and try eating more fruits. They'll give you more vitamins and minerals

Me...

I used to date a periodicals librarian…

…but we broke up because she had too many issues.

Can we please stop posting chemistry jokes?

I keep seeing the same jokes reposted periodically.

This joke may contain profanity. 🤔

Can you write with a tampon?

Only periodically.

How often are chemistry jokes posted to reddit?

Periodically

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