Why Your Pee Looks Like A Chain

From Steve Mould.

The first 100 people to go to https://blinkist.com/stevemould will get unlimited access for 1 week to try it out. You’ll also get 25% off if you want full membership.

Have you noticed the shape of your urine stream when you pee? It does this twisty undulating thing. But why? And why do the same waves appear when you pour a liquid from a container?

Here’s my video featuring Rayleigh instability:

Here’s my video about the Lattice Boltzmann Method:

The fake medical advice at the end comes courtesy of not-fake Doctor Rohin Francis. This is his excellent channel:

Here are a couple of good videos on laminar flow:

Image and video credits:
The video of water floating in microgravity is by NASA
The Lattice Boltzmann animation is by Richard Sear

You can buy my books here:

You can support me on Patreon here:

just like these amazing people:

Matthew Cocke
Glenn Watson
Joseph Rocca
Joël van der Loo
Doug Peterson
Rashid Al M
Paul Warelis
Will Ackerly
Heather Liu

Twitter: http://twitter.com/moulds
Instagram: https://www.instagram.com/stevemouldscience/
Facebook: https://www.facebook.com/stevemouldscience/
Buy nerdy maths things: http://mathsgear.co.uk