NEW YORK — In 1917, a man named Max Fleischer invented the rotoscope, a combination of projector and glass drawing board that allowed animators to trace over live-action film, one frame at a time.

Add Yahoo as a preferred source to see more of our stories on Google. An early version of the famous Betty Boop character is now in the public domain. - Zhe Ji / Contributor via Getty Images ...

Today, Betty Boop is an immediately recognizable cultural icon, appearing on everything from luggage to coffee mugs to chunky heels to board games. Photo illustration by Meilan Solly / Photos: ...

In this odd pairing, legendary singer, dancer and bandleader Cab Calloway starred in these surreal Betty Boop cartoons to promote his music, “Minnie the Moocher” and “The Old Man of the Mountain.” ...

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