Sometime between 5pm Fri and 5am Sat GMT a large satellite is going to fall to earth. NASA's Upper Atmosphere Research Satellite has come to the end of its life and is now destined to become a nice fiery mark in the sky....
...if it wasn't for that part that several chunks of it are big enough to survive re-entry.
The reckoning is that half a ton of debris will make it to the ground including fuel tanks and the structures. The good news for the Americans is that it is unlikely to be falling over the USA. Bad news is they don't know exactly where it will land.
The amusing part is that if it does land near you, you should return the bits to NASA. I bet if it lands on your house, NASA wont be paying for the repairs.
More details here
I wonder how much a titanium fuel tank is worth to a scrap dealer.