Mars is our closest neighbor, and a little robot named Curiosity is investigating the planet for us. Join for a tour of the place this rover calls home. Get to know Mars through the perspective of the adorable robot in charge of exploring it all. And this rover's birthday is a perfect time to celebrate curiosity. For nerdy parents, fans of space, or those who are just curious, relive the moment when the Curiosity rover sang itself happy birthday in 2013 after one year on Mars.