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TIL According to the International Olympic Committee, gold and silver medals are required to be at least 92.5% silver. The gold in gold medals is in the plating outside and consist of at least 6 grams of pure gold. Silver medals are made of pure silver, while bronze medals are 95% copper and 5% zinc

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kJep5 TIL that Linoleum is considered to be the first genericized trademark, having lost the ability to obtain trademark protection in the late 1800s — just 14 years after its introduction.
05eR TIL - Ford’s invention of the moving assembly line allowed cars to be created so quickly that “Japan Black” was the only paint that could dry fast enough to keep up, thus his famous quote, “Any customer can have a car painted any colour that he wants so long as it is black”.
8eLAX TIL that due to their long association with humans, dogs have evolved the ability to thrive on a starch-rich diet, which would be inadequate for other canid species.
nWo0B TIL: The Artic Circle and Antarctica are named for Arktos (Greek for Bear) Antarctic = No Bears. While there are no polar bears in Antarctica, the "Bears" in question are Ursa Major and Ursa Minor (which contains the North Star) - Neither constellation is visible from Antarctica (i.e. NoBears land)
nWeXo TIL that after Lance Armstrong was stripped of his wins, seven successive Tour de France races (1999-2005) were officially declared without winners because so many riders who finished behind Armstrong were also associated with doping offences.