Horseshoe crabs use their tail to right themselves when they get flipped upside down. I found one last month that had its tail chopped off by a boat propeller, so it can’t turn over and will eventually die. I made a prosthetic tail out of a plastic knife and sheep castrator bands (don’t ask) and it works great. See him in action.
If it’s your birthday today and you've just turned eleven, you could be the corduroy messiah.
Although the state of Arizona retains ownership, you can adopt a desert tortoise, raising a baby and friend for the next 40 - 50 years. It’s a preservation program run by the Sonoran desert museum. Although it doesn’t say, I assume you need to actually live in Arizona to qualify as a tortoise custodian.
You’ve probably seen the ads for ZBiddy and other “penny auction” sites. They sell high-ticket items for practically nothing by charging for each penny you bid. There is even some concern that they should actually be considered gambling sites, since you lose money with nothing to show for it if you don’t win the bid. Here’s a review I looked up after considering bidding for an iPad. I won’t be using these sites.