Physicist recommends US develop 'portfolio of fuels, electricity and efficiency'
Expert likens scalability of current alternative energy technologies to wild animals: fuzzy and cute when they're small, impractical at a large scale
Engineers probe spiders' polymer art
Manufactured silk could be used for artificial tendons and ligaments, sutures, parachutes and bulletproof vests
Portable 'lab on a chip' could speed blood tests
MIT micropump assures portability, efficiency, in routine or combat conditions