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

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 ...

New research using smartwatches shows that older adults can accurately assess how well they are thinking in the moment. The study finds their self-ratings closely match actual cognitive performance.

How observant are you? The jungle is dense, and the camouflage is perfect. A tiger is lurking and the clock is ticking—can you locate it in just 8 seconds? Optical illusions have long been used to ...

Get exclusive reporting, live Q&As and ad-free reading. (The four forms represent four different versions of the test -- you can choose whichever one you'd like to take. It is not necessary to fill ...