Today's Free App of the Day is Learn Muscles: Anatomy
Originally $2.99

This is a useful tool for anyone wanting to study anatomy. It has quizzes and videos in addition to pictures and charts. Note: I took one of the quizzes without any prior study and surprisingly, got 3 of 10 correct. (Surprised that I got that many!) I laughed out loud to get a score of "Pea Brain." If you don't like being abused by your apps, this may not be the app for you. :p

28 of 41 reviews are four stars and above.

These apps are compatible with the original Fire and with my Fire HDXs. To tell if an app works for your Fire HD or other Android device registered to your Amazon account, click on the above link and look on the right side of the web page. Amazon will tell you if it will work with your registered device.

Have fun!

Also check out the other digital deals from Amazon, including great deals on MP3s and videos: