This Day, That Year – May 10

US atomic submarine USS Triton completed the first submerged circumnavigation of the globe on this day in 1960.

Did you know that:

• Benjamin Franklin first tested his lightning rod on this day in 1752
• Physician Cluny MacPherson first presented his gas mask invention to the British War Office on this day in 1915
• Halston Sage is an American actress born on this day in 1993, known for her role as Grace on the Nickelodeon television series How to Rock