Structures of the clamp loader–clamp complex reveal that nature uses machined parts in the form of a spiral scaffold (the clamp loader) to thread a circlet (the clamp) on a helix of DNA. The scaffold ...

A number of reasons cause wheel looseness, but topping the list is improper torque. When you torque down a nut to the recommended level, it stays put. But to maintain the proper torque, you have to re ...