We're back for another week of new iPad apps. This time we have an app that will teach you something, and another that will test your knowledge of pop culture. And neither will cost you a cent.
IBM Think: How did we get from the invention of the wheel to the personal computer? It's been a long road, marked by very important developments along the way. Based on IBM's Think exhibit staged in New York City last year, this app maps innovation in a beautifully designed package. Free.
Trivia Party: You don't have to go to the pub for a trivia night. You challenge your friends' cultural know-how anytime with this competitive app. No friends? No problem. Fire up solo mode. Free.