writes "Does that sketchy bridge on your commute to work freak you out? How about that budget airplane seat your boss puts you in once a month? If you're nervous about that, then you'll probably freak out about this: Future airplanes, bridges, boats, even spacecraft may be built from modular blocks that snap together like Tinkertoys. While the idea seems strange, the parts are claimed to be up to 10 times stiffer than existing ultralight materials and the construction work will be done by tiny robots crawling along the structure as it's built. It would even be possible to disassemble one structure, say, a bridge, and repurpose it into a new building. Imagine taking apart one wing of your office building and turning it into a boat--just be sure to bring your life jacket."