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General: How many laser pointers to kill a human?

The gadget website Gizmodo on October 15 2015 ran a story entitled “How Many Laser Pointers Would It Take to Kill a Human?”

Author Adam Clark Estes begins with a primer on laser light, and determines that the beams from many lasers would have to be focused on a single spot. Estes quoted Dr. Rebecca Thompson of the American Physical Society:

“…if you wanted to create a death ray with laser pointers, you could buy 200,000 laser pointers [cat-toy type with 5 milliwatt output each], mount them on a piece of a sphere with radius 5.5’, aim them all through a lens and ask your victim to sit very, very still.”

The article concludes “Do not try this at home.”

From
Gizmodo. Thanks to Roberta McHatton for bringing this to our attention.