Seeing the Invisible

What if you could see the way the wind blows? Or even the small changes in air movement or temperature in the room you're in? Derek Muller of Veritasium explains the process called Schlieren photography, which shows us those things that we can't normally see.

(YouTube link)

It boils down to concentrating an image of those invisible movements into a form that becomes visible to the eye. No, I don't totally understand it, but it certainly is cool to watch! -via Laughing Squid


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Aah lol, yes, he's running away from his brother and the fury of his fans after having cancelled the show in France.

More seriously, there's a lot of hype about using discarded materials to create pratical or decorative objets, the idea is obviously good, I think however that these items should sell for a fair price.
Remember the tinny tin can cars, planes and motos made in Africa? I thought that when these items were in shops the overprice was due because the shops paid the creators a good one, but not. The shops just make enormous profits by taking advantage of press covers and customers who think they do a good action like for fair trading...
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