Nielsen/NetRatings, a syndicated rating system for Internet audience measurement, measured markets in Brazil, Germany, Spain, Switzerland, Sweden, the United Kingdom and the United States and found them to be maturing.

NASA has a new Vision for Space Exploration: in the decades ahead, humans will land on Mars and explore the red planet. Brief visits will lead to longer stays and, maybe one day, to colonies.

First, though, we’re returning to the Moon.

There are 36 grand masters of memory in the world. Only one lives in the United States.

Adolf Hitler’s “Mein Kampf” has suddenly become a best seller in Turkey, following the release of two cheap paperback versions.

A Stanford University researcher has gotten a preliminary go-ahead to create a mouse with a significant number of human brain cells — as long as the creature behaves like a mouse, not a human.