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Imagine sitting down to dinner with a group of friends, when a laser tickles the water molecules inside your ear.
"You need to get home right away," your older child shouts. The younger one has fallen and cut their knee, and might need stitches.
Exit - Friends - Idea - Message - Rest
You stand up, excuse yourself, and make for the exit. Your friends have no idea why, but assume you heard a message inaudible to the rest of them in the noisy room, transmitted into your ear by laser light.
That's the future scientists at MIT imagined when they developed a laser system for sending sound across a room using laser light.
Not that much water is needed.
"This can work even in relatively dry conditions because there is almost always a little water in the air, especially around people," research team leader Charles Wynn said in a statement. "We found that we don't need a lot of water if we use a laser wavelength that is very strongly absorbed by water. This was key because the stronger absorption leads to more sound."
Point - Messages - Individuals - Crowd - Loudspeakers
The point of all this is to send messages to individuals in a crowd without blasting them over loudspeakers.
"The ability to send highly targeted audio signals over the air could be used to communicate...
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"However, when the Son of Man comes, will he find faith on the earth?" Luke 18:8