A free Abraham Lincoln app for smartphones has been officially launched to coincide with the 16th president's birthday.
The Abraham Lincoln Presidential Library Foundation and AT&T announced the application Tuesday.
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History buffs can learn Lincoln facts using the app, quiz themselves about his life and see pictures of the presidential museum.
One feature -- called "Abe-a-day" -- gives a daily reminder of what Lincoln accomplished for the nation.
The free app's sound effects are based on sounds Lincoln and his family heard every day. The quiz timer is a recording of Lincoln's office clock ticking. A wrong answer triggers the clock's gong. A right answer is greeted by Robert Lincoln's dinner bell.
The app is available for iPhones and for phones using Android-based operating systems.