Tucked between their legs while walking.","length":210} {"fact":"A

A knuckle tattoo is a kind of tattoo on the tops of a person's fingers, between the knuckles, commonly two groups of four-letter words or one eight-letter word. It is not necessarily a prison tattoo, as sometimes believed, but remains an unpopular form of tattoo—alongside hand tattoos in general—due to the difficulty of hiding it in situations such as a formal setting where it would be seen as crass. Some people also use their knuckles to tattoo drawings and images, sometimes in groups of four, such as the four symbols of a deck of playing cards.

Joseph Farran Zerbe was an American coin collector and dealer who was the president of the American Numismatic Association (ANA) in 1908 and 1909. He served as chief numismatist at the World's Fairs in St. Louis (1904), Portland (1905), and San Francisco (1915).

Estrogen is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens that have estrogenic hormonal activity: estrone (E1), estradiol (E2), and estriol (E3). Estradiol, an estrane, is the most potent and prevalent. Another estrogen called estetrol (E4) is produced only during pregnancy.