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News · 03-25-2014, 03:10 AM

If you put your hand over a switched-on torch in the dark, it appears to glow red. This is because long-wavelength red light beams penetrate human tissue more effectively than short-wavelength blue light.

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03-25-2014, 03:10 AM	#1
News Senior Member Join Date: Oct 2007 Posts: 20,156	Researchers exploit plasmonic nanoparticles to kill tumour cells If you put your hand over a switched-on torch in the dark, it appears to glow red. This is because long-wavelength red light beams penetrate human tissue more effectively than short-wavelength blue light. More...