It may seem counterintuitive at first, but using a dull blade is actually more dangerous than using a knife with a sharpened blade. The reason for this is that a dull blade is more likely to slip off ...

Tonight on "Nightly News" we told viewers about a cognitive self-assessment test developed by researchers at Ohio State University that can help determine your mental acuity.

Day-to-day changes in mental sharpness - not motivation or personality - can determine whether tasks feel effortless or ...

A new U of T Scarborough study finds that being mentally sharp can translate into a productivity boost equivalent to about 40 extra minutes of work each day.