Uploaded August 2020 | Updated September 2026, 2 weeks ago

---

You can pre-order Tim's book How to Make the World Add Up now!
mathsgear.co.uk/products/how-to-make-the-world-add-up-signed-hardback

Watch Tim Harford talk about the Stork-Baby correlation on Numberphile:
youtube.com/watch?v=-n-d1ApBTFw

Here is the current Landmark Number recommended toolkit (yours may differ).
- population of the country you live in
- 'people days' per year in your countries of choice
- GDP or total government budget
- heigh of some buildings you have seen
- a human lifetime is around 30,000 days
- million/billion/trillion seconds

More about Tim Harford:
timharford.com

Huge thanks to The Vintage Red Bus Company for lending us one of their fantastic buses.
thevintageredbuscompany.co.uk

"Asteroid the size of a bus hurtles past Earth"
independent.co.uk/news/science/asteroid-the-size-of-a-bus-hurtles-past-earth-9323762.html

CORRECTIONS:
- We were in front of a long version of the original Routemaster bus which I believe was technically 29.91 feet, but we were told 30 feet and that is an easier unit of measurement.
- Let me know if you spot any mistakes!

Thanks to my Patreons who mean I can hire a bus and then pay someone to animate a dinosaur walking behind it. Here is a random subset of those fine Patreon People:

Ben White
Jacob Hartmann
Nikola Studer
Morgan Butt
Alan H.
Kragar
John Lewis
Glenn Watson
James Hall
Philippe von Bergen

patreon.com/standupmaths

As always: thanks to Jane Street who support my channel. They're amazing.
janestreet.com

Filming and editing by Trunkman Productions trunkman.co.uk
Additional camerawork by Ben Westaway
Animations by William Marler wmad.co.uk
Music by Howard Carter
Audio by Peter Doggart
Design by Simon Wright and Adam Robinson

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com
US book: penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker
UK book: mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback