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flag Mathematician Dr. Tom Crawford will substitute for Rachel Riley on Channel 4's "Countdown" for three weeks.

flag Mathematician Dr. Tom Crawford, known for his YouTube channel "Tom Rocks Maths" with over 200,000 subscribers, will cover for Rachel Riley on Channel 4's Countdown for the next three weeks. flag Crawford, who holds a PhD in applied mathematics and teaches at Oxford and Cambridge, aims to make math more accessible. flag He will appear alongside hosts Colin Murray and Susie Dent, with special guests like Sir Stephen Fry.

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