The Ultimate Laptop: A Black Hole: “In the most extreme version of this computer supreme, so much computational circuitry would be packed into so small a space that the whole thing would collapse and form a tiny black hole, an object so dense that not even light can escape its gravity. If that sounds like a rather dangerous device to hold on one’s lap – ‘Opening the lid,’ Dr. Lloyd warns, ‘voids the warranty’ – there is a serious purpose to his theoretical tour de force: to plumb the absolute limits nature sets on computation.”