if( aicp_can_see_ads() ) { $adCode = '
'; return $adCode; } else { return '
'; }

Light waves, visible and invisible

Each kind of light has a unique wavelength, but human eyes can only perceive a tiny slice of the full spectrum — the very narrow range from red to violet. Microwaves, radio waves, x-rays and more are hiding, invisible, just beyond our perception. Lucianne Walkowicz shows us the waves we can’t see.

Lesson by Lucianne Walkowicz, animation by Pew36 Animation Studios.