It's not a chocolate coin wrapped in gold foil¹, people. That's actual metal that composes that Olympic medal, so why do athletes bite them? 

 

大伙儿，这可不是包裹在金箔纸里的金币巧克力，奥运会金牌是货真价实的金属制品，那为什么运动员热衷于咬金牌？
 

 

There's actually a few reasons, but the most obvious is that it's a pose² photographers really, really like to capture. 

 

"It's become an obsession³ with the photographers," David Wallechinsky, the president of the International Society of Olympic Historians⁴ and co-author of "The Complete Book of the Olympics" told CNN in 2012. "I think they look at it as an iconic shot, as something that you can probably sell. I don't think it's something the athletes would probably do on their own." 

 

Biting down on a hunk of metal is more likely something someone might have done during the Gold Rush to test whether the shiny golden rock they just panned for was actually pyrite or fool's gold. Human teeth are harder than gold but softer than pyrite, according to the Mohs Hardness Scale. This means a quick gnaw⁵ to real gold would actually leave an indentation. A hard chew of pyrite, meanwhile, might damage your teeth. 

 

The practice also once served to see whether coins were solid gold or just gold-plated over a cheaper metal, Today I Found Out explains. 

 

With that in mind, it's likely that Old West/pirate lore⁶ led to someone once biting their Olympic medal in a spontaneous⁷, "Is this real life?" moment, and the photographers thought it was cute. Because if someone really was hoping to discover whether that gold medal is pure gold, their smiles would quickly fade. 

 

Olympic gold medals are actually just 1.34 percent gold. The rest is sterling⁸ silver. And much of it is recycled silver this time around, which makes the 20-16 Rio medals "the most sustainable ever made," according to Forbes magazine contributor Anthony DeMarco. DeMarco says the materials that make up a "gold" medal are worth $564.

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