The Olympics weren’t ancient Greece’s only games: the Pythian, Nemean, and Isthmian contests joined them to form the Panhellenic Games.

A 2016 study found that only about half of perceived friendships are mutual.

Citrus essential oils, like orange and lemon, reduce stress by uplifting mood through the limbic system. A recent study showed sweet orange oil significantly lowered stress levels.

Dogs have been banned from Antarctica since 1994 to prevent the spread of diseases to the native seal population.

Obese drivers are 80% more likely to die in car accidents compared to drivers of a healthy weight. This is because obesity can interfere with seatbelt positioning.

Your sweat is smellier when it's caused by stress (versus sweating from exercise). This is because stress sweat is produced by the apocrine glands, and is thicker with more fat and protein.

Since its inception in 1886, the World Chess Championship has seen only one title decided by a checkmate - nearly a century ago, in 1929.