Printer, scientist, and founder who turned thrift, wit, and small daily experiments into a working system for getting on in the world.
She got the machine to do the copying, then spent twenty years losing the argument about where the field should go next.
Do the homework, find the one big idea, promise a real benefit — and keep the one test that actually counts: did it sell.
The founder of American psychology, who mapped habit, attention and belief — and wrote the frankest account of melancholy in English.