 It's the right-handed one, apparently, that is associated with Alzheimer's disease. The left-handed one is harmless. That would explain the mystery of how it's possible that your brain could be gummed up and yet you're clear with no problems at all. So this could be then done at the molecular level. Quantum computers can then begin the process of separating out the left-handed and the right-handed versions of the amyloid protein.