Start communicating in American Sign Language with this handy app. Made up of a series of video clips, the app makes it easy to begin really saying something with your hands.

Readers are asked to evaluate Helen Keller's claim, and the evidence she uses to support her argument, that it is more difficult for hearing impaired children to learn to talk with others.

We know that the type of soil varies by location, but does the seafloor sediment also vary, or is it all the same? Scholars compare photos of the seafloor from two different locations: the Savannah Scarp and the Charleston Bump. Through...