Must-see videos of the week: June 9 to 15

This week's must-see videos take you from the Corvette-eating sinkholes of Kentucky to the quad-burning hills of San Francisco. We've also got a woman who lives like a hobbit, a tech-savvy cat and some soccer-loving astronauts.

But first, we take you to China to meet Chen Fengzhi, a 63-year-old woman who chomps away on glass and stone with her so-called "iron teeth." Do not try this at home!

These astronauts may be far away from Brazil, but that hasn't dampered their World Cup excitement one bit. Their zero-gravity tricks might be more impressive than anything Neymar or Messi pull off this month.

In the age-old debate over whether cats or dogs are smarter, we submit this evidence: a seven-week-old kitten playing an iPad game.

Ever thought about living off the grid? This Welsh woman does just that, living in a mud-and-straw home without electricity, gas or running water (Warning: video contains mild language).

Back in February, a sinkhole swallowed eight cars — and subsequently over a million dollars — at the National Corvette Museum in Kentucky. As it turns out, it was a blessing in disguise.

And finally, we leave you with footage of an insane feat of urban cycling. Just watching this bike messenger climb San Francisco's second steepest hill is enough to give you muscle burn.

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