United Kingdom, Sept. 3 -- Jessica Chastain has "got the hots" for statistics.

The 48-year-old actress is currently studying for her Master's degree in public administration at Harvard University, having previously graduated from The Juilliard School as an actress.

Explaining why she decided to go back to school, she told The Tonight Show Starring Jimmy Fallon: "I was just wanting to learn new things.

"And you know what? My favorite class ended up being quantitative methods, which is like statistics.

"And at Juilliard, you know, we never... As theater nerds we never got to learn stuff like that.

"So I am a secret nerd. I got the hots for, like, scatter graphs and, like, bell curves."

The Molly's Game star is studying at the universi...