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Numbers as products of primes (a useful calculation practice). And the general beauty of primes.

Simon spent hours calculating – something he’s not particularly fond of if it were simple/ pointless sums, the way schoolkids work. His was not pointless!  He did it with the … Continue reading Numbers as products of primes (a useful calculation practice). And the general beauty of primes.

Wobbly Circles and the Center of Mass

What shape can roll well, other than a circle (wheel)? Two circles, attached together according to a formula involving a square root of two! Simon made these “wobbly circles” inspired … Continue reading Wobbly Circles and the Center of Mass