Augustine Toeler, a German physicist of the nineteenth century, created a photographic technique called "Schlieren Flow" visualization, which allowed visually capture these density changes as the light to poke through mediums of different density, and it bent over.
This has helped scientists and engineers see things that are normally invisible, such as the rising heat of the candles, the aircraft wing dissect the air or particles spread when you sneeze.
Probably not at all important whether you are a physicist or - generally to what the specialty here is, to see and know things like that just interesting and useful.
Everything we know ever to customize and your own life.
And some things have to special laws of physics, directly laying the path for you through life.
And as looks visually sound?
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