Technology developed for the International Space Station and a Mars rover is helping European auto-parts manufacturers to engineer lighter, stronger and safer drivetrains and axles. Bolts are the manufacturing world's unsung heroes. If two parts aren't welded together, there's probably a bolt at work and an engineer figuring out how tight it needs to be. Stretch it too much and it might damage the parts. Too loose, it may wiggle. Using space-sensor technology, German company Intellifast has created a bolt with an internal sensor to measure the stress while the bolt is in place. Read more