Kindle
The Energy Fiend website -- a fan-site for energy drinks -- has a calculator into which you enter your weight and your favorite caffeinated beverage and it will tell you how many drinks you need to take before dropping dead. I don't know if this is accurate, but OTOH I don't want to drink 171 grande cappuccinos to find out.
Link
(Thanks, Bill!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.