Cakes, Custard and Category Theory - Eugenia Cheng
Most people imagine maths is something like a slow cooker: very useful, but pretty limited in what it can do. Maths, though, isnt just a tool for solving a specific problem - and its definitely not something to be afraid of. Whether youre a maths glutton or have forgotten how long division works (or never really knew in the first place), the chances are youve missed what really makes maths exciting.