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Rolling parabolically

If you roll a parabola along a straight line then the shape its focus traces out as it goes is ... a catenary!
Blog post

Find out what you didn't know you didn't know!

Why do diamonds sparkle? Where is the 4th dimension in Dali's paintings? Find out the answer to these and 98 other questions about maths and art at John Barrow's talk to launch his new book.
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Ten years, 100,000 teenagers

Happy tenth birthday to Maths Inspiration – the fantastic project that has delivered interactive maths shows to over 100,000 teenagers!