Instruct: Classify the given Amazon review as either positive or negative.
Query: too bad it's all balderdash

It's been twenty years. Over 50 million bucks have been spent on Nanotechnology, and not a single useful thing has come of it.Drexler writes really gee-whizzy stuff, but he's basically selling snake oil. Anybody with the basic clue about the law of scale can see most of the nanotech concepts are basically impossible. Meachnical devices can't be scaled down much below the millimeter level-- the basic laws of scale, friction, surface tension, charge, and materials disallows it. So Nanotech guys make microscopic "gears", but no shafts. Shafts, but no gears. "Motors" that can't turn anything. A 5x5 atomic checkerboard, a factor of 100 billion too small to be useful. And so on, and so forth.It's a clever book, but basically intellectually dishonest. Drexler went on to raise $20 million in venture capital and blew it all. That should give one pause when compared to the "limitless horizons" extolled in this book.