The first 200 people to sign up at https://brilliant.org/stevemould will get 20% off an annual subscription.
Putting ballpoint pen ink on the tip of a leaf then putting it on water (or milk if you want it to stand out) causes the leave to whizz around leaving trail of ink behind.
Here’s the video I did with Matt using oleic acid to calculate pi:
Here’s my spinning glue video:
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just like these amazing people:
Joel Van der loo
Buy nerdy maths things: http://mathsgear.co.uk