Grover Swartzlander first began to examine a revolutionary concept in optical physics after studying the flight of a moth. He watched the animal use its wings to create lift, which led to flight. Swartzlander asked a simple question: Could light be used to create the same effect?

http://www.rit.edu/news/athenaeum_story.php?id=48123




SI units :
ENERGY / SPACE = [ Joul / cubic meters = Newton *meter / cubic meters = N/m^2 ]

Poland 31-10-2015 17:59 Polish local time
HOW BIG FORCE IS PUSHING CAMERA ?
( camera is registering brightness 190 000 points !!! )