Articles by Jakob Stein Jakob SteinJakob is a PhD student and mathematician from London and works mainly in differential geometry. In his spare time, he likes to draw, and think about mathematics in art.All articles by Jakob Page 3 model: The potato Earth25 May 2022How Kelvin estimated the age of the Earth by thinking about a baked potatoPage 3 model: Woollen jumpers22 November 2021How did your favourite sweater become so big? And how big can it get?