This week brings apps that will add a little more knowledge into your life. From satire and current events, to math and nature facts, you'll be using your tablet to flex the old brain muscle.
Minds of Modern Mathematics: Mathematics influence every aspect of the world we live in, though we don't often think about number in those terms. Recreating a 1961 installation created by designers Charles and Ray Eames, this iBM-sponsored app puts it into context, with a 1,000-year history of the subject as well as profiles of prominent mathematicians and nine educational videos. Free
National Geographic Today: Never miss a highlight from National Geographic with this app, which offers the best articles, photos, and videos that have appeared on its website in a given day. Part of what makes the magazine so wonderful are its amazing photos, which look fantastic on the new iPad's retina display. Free
The Daily Show Headlines: Laugh along with the best of Jon Stewart's bits from the last two weeks. Though it lacks full episodes, this app lets you see what's coming up on The Daily Show with upcoming guest news and schedules. Plus, you can check out the funniest clips in addition to exclusive content. Free