# The other "Golden Rule"

- Institution: TED
- Department: TED-Ed
- Speaker: David L. Hu
- Year: 2020
- Level: For everyone
- Language: English
- Subjects: Physics, Biology, Teaching and learning
- Source: [TED](https://www.ted.com/talks/david_l_hu_the_other_golden_rule)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

A cat's bladder can only store a golf ball's worth of urine. For humans, it's a coffee mug and for elephants, a kitchen trash can. An elephant's bladder is 400 times the size of a cat's, but it doesn't take an elephant 400 times longer to pee. So, how does this work? David L. Hu digs into what scientists call the "Other Golden Rule." \[Directed by Anton Bogaty, narrated by Jack Cutmore-Scott\].

## Lectures

1. [The other "Golden Rule"](https://invisiblenetwork.ai/learn/ted/david_l_hu_the_other_golden_rule/b816792232e8), 5 min (TED's player)