I once worked at a propane distributorship where I learned two things that stuck—how to back up a trailer holding a 1,000-gallon tank so that its four steel feet would settle squarely on small blocks.

Add Yahoo as a preferred source to see more of our stories on Google. Research shows that crossword puzzles are effective in improving memory. (Getty Images) (artisteer via Getty Images) There is no ...

Boost your brainpower with our timed memory game. Flip tiles, race against the clock, and see how sharp your recall skills ...

You get a few seconds to sear a color into your brain. Then you have to find it again with a set of hue, saturation, and brightness sliders. Then you do it four more times. You can challenge yourself, ...