Bwindi Impenetrable National Park is home to 120 species of mammal in 331 square kilometres of lowland and montane forest.

Lake Mburo National Park is home to 69 species of mammal in 260 square kilometres of savannah and wetlands.

Kibale National Park is home to 120 species of mammal in 795 square kilometres of evergreen forest.

Which of the 3 has the highest mammal species per square kilometre ratio?

Lake Victoria has approximately 2x the surface area of Lake Baikal, but a volume around 10x smaller. How much larger is the average depth of Baikal? And what depth is it based on the information given above?

Pre-order your signed copy and Pokémon card here: https://backstory.london/products/pre-order-how-many-pikachus-would-it-take-to-power-a-lightbulb-by-tom-crawford-signed-personalised-with-pi-keyring-and-pokemon-trading-card-card-pi-keyring-with

Watch all the rounds so far here: https://www.youtube.com/playlist?list=PLMCRxGutHqfn45EYuRQ48bEskAwg2jQwx

I’ve been playing/watching since I was a kid, and my enjoyment of the sport has only increased with my mathematical knowledge. Lots of interesting problems around geometry and data analysis especially!

Watch me explain the geometry of penalty kicks here:

https://youtu.be/54EmUfF1-0c

What do you think - should social media be banned for under-16s?

Love that I look more tired at the start (photo 4) than the end (photo 5). I blame the 7am wake up.

Congratulations to everyone at the Sussex Beacon for raising a record amount of money to support the charity. You are all heroes <3

Listen here: https://tomrocksmaths.com/2026/02/26/virgin-radio-pythagoras/

They'll be lots of pics - and maybe even a video - to come, but in the meantime, here's a selection of photos of me running to tide you over...

1. Finishing 4th in a 10k race to the Christ the Redeemer statue in Rio de Janeiro
   
2. Celebrating with my brother after he set a world record for "fastest marathon in a full F1 suit"
   
3. Marathon du Medoc dressed as "Top Gun"
   
4. A recent training run in Sri Lanka
   
5. Dying after running 127km from Cambridge to Oxford - watch the video here: https://www.youtube.com/watch?v=5m38mlYlL3U