Thought Exploratorium

Later, at university, his roommate returned home one day to find him leaning out of a window on a freezing winter’s day, stirring something in a bowl.

Feynman had suddenly become intrigued by a problem - could jelly set at freezing temperatures if constantly stirred?

It is incidents like this that prompted physicist Freeman Dyson to consider him “half genius, half buffoon”. He would later correct this to “all genius, all buffoon”.