From the history of maths
David Hilbert
In 1900 he set out 23 problems that shaped twentieth-century mathematics.
His imaginary hotel with infinitely many rooms, always able to fit one more guest, is a favourite way to feel how strange infinity is.
Unknown author, Public domain, via Wikimedia Commons
Where you’ll meet Hilbert here
LogicGeometry
They turn up beside problems and lessons on these topics.
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Shakuntala Devi
Known as the “human computer”, in 1980 at Imperial College London she multiplied two 13-digit numbers in her head in 28 seconds.
She also wrote popular books of puzzles and mental arithmetic.
Central News Agency (Taiwan), Public domain, via Wikimedia Commons