Surprising Cameos From Celebrities Before They Were Famous

Elon Musk, Iron Man 2

Tesla and SpaceX CEO Elon Musk runs into Tony Stark at an event and they of course talk shop. Stark compliments Musk's "Merlin engines," to which he replies "I’ve got an idea for an electric jet!" That invention will surely surface any day...

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The More You Know

  • There is a fish with transparent bones and white blood.
  • Hippos produce their own sunblock.
  • The Japanese created a smoke alarm for those who can't hear, which pumps super-spicy wasabi mist into the air to alert them.
  • Donkeys and dolphins are sometimes used as guard animals.
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