This Day, That Year – April 27

The first atomic-powered electric-drive submarine, the USS Tullibee, was launched on this day in 1960.

Did you know that:

• Elijah McCoy was granted a patent for an air-brake pump lubricator on this day in 1920
• Xerox PARC introduced the computer mouse on this day in 1981
• William Moseley is an English actor born on this day in 1987