Some clever iPhone programmers figured out there's a lot of money to be made in giving away applications free of charge. Temporarily dropping an app's price to $0 can boost interest and word of mouth, potentially creating new customers once the app goes back to its normal price. Apps Gone Free tracks these lightning deals and lists the apps that are worth checking out – if you act fast. This iPhone and iPad app is, of course, free of charge.
The art of numbers
The Story of Math Collection is a delightful, award-winning array of films that bring that most arcane and challenging of disciplines to hilarious but meaningful life. Through the title film as well as "The Code," plus "The Music of the Primes," the set explores the colorful history of numbers, the music of prime numbers, and hidden patterns inside nature. Out on DVD from Acorn Media.
A shuttle tribute
PBS takes us back to that fateful day, Feb. 1, 2003, when seven Columbia shuttle astronauts died. Space Shuttle Columbia: Mission of Hope is an hour-long documentary that tells the story about crewmember Ilan Ramon's "mission within a mission." Israel's first man in space, the son of Holocaust survivors, took a Torah scroll with him on his journey – the fulfilling of the nation's dream. Actor and space enthusiast Tom Hanks produced the documentary, which airs Jan. 31.