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 ...

New research using smartwatches shows that older adults can accurately assess how well they are thinking in the moment. The ...

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 ...

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 ...

Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content. (The four forms represent four different versions of the test -- you can choose whichever one you'd ...