The electric chair and cotton candy were both invented by dentists - Dr. Albert Southwick and Dr. William Morrison, respectively.

According to a 2010 study, people fluent in multiple languages almost always swear in their native tongue.

At the Poison Garden of Alnwick Castle in England, many of the plants are so deadly they're grown in cages — even touching or smelling some of them can kill you.

While they might look the same, Jenga blocks have subtle differences in dimensions to make their construction less stable. Each brick is a different size and weight, so no two games are alike.

A study by the University of Glasgow found that, like humans, dogs have individual music preferences — but they generally prefer reggae and soft rock over other genres.

Studies show that among young, elite chess players, a higher IQ offers no advantage and may even be a slight disadvantage. Success in chess depends more on adaptability, pattern recognition, and creativity than on raw cognitive ability.

​Studies suggest that habitual napping benefits health, with the optimal nap time between 2 p.m. and 4 p.m. The ideal nap duration is typically 20 to 30 minutes. ​