Here's a really unique way to tour the United States from a different perspective. If a drop of rain fell anywhere in the US you choose, what path would it take to the ocean? River Runner will show you! I dropped a raindrop in Kentucky and followed it downstream through hills, farmland, cities, and around numerous bends to the Ohio River and into the Mississippi River. Since I live on a river bank, I then went back in and found my home and the path that water takes.
Explore the waterways of America with this cool application, but keep in mind there are a few places in the US where a raindrop will not make it to the ocean. -via Metafilter