At this moment, more than one thousand trillion ants are scurrying all over the Earth. If every human climbed aboard one side of a scale, and every ant crawled onto the other side, the scale would just about balance. (Source: www.antweb.org/)
Many ants enter homes from outside nests as they forage for food. To find their nest, follow the ants. You can encourage foraging by setting out attractive food. (Source: extension.umn.edu)