These sound like good books to read. If you poke around gatesnotes.com you'll also find a video of Bill Gates and Warren Buffet testing mattresses. Looks like

These sound like good books to read. If you poke around gatesnotes.com you'll also find a video of Bill Gates and Warren Buffet testing mattresses. Looks like fun! https://www.gatesnotes.com/About-Bill-Gates/Testing-Mattresses-with-Warren-Buffett https://www.gatesnotes.com/About-Bill-Gates/Testing-Mattress...