It's hard to believe such a common medical tool could be so dangerous, but it is.
Doctors are not washing their hands...
You may have seen episodes of CSI where the bad guys are catch by matching fingerprints. Now, science may be able to match their hand bacteria.
Do hand sanitizers work any better than soap and water? Find out on this Moment of Science.
Does hand movement while talking help one's memory? Find out on this Moment of Science.