Homework

http://commons.wikimedia.org/wiki/File:Maria_Gaetana_Agnesi.jpg

On several occasions, mathematician Maria Agnesi (1718-1799) arrived in her study to discover that a vexing problem had been solved for her — and, eerily, solved in her own handwriting.

Agnesi was a somnambulist. In her sleep she would walk to the study, make a light, and solve a problem that she had left incomplete.

Then she’d return to bed with no memory of what she’d done.