Directory For a Sex Photos : all-thats-interesting: Schlieren OpticsThese specialty cameras are designed to pick up the refraction changes in light. When different gases (like helium or sulfur hexfluoride) are introduced at different temperatures, the way light passes through them
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» all-thats-interesting: Schlieren OpticsThese specialty cameras are designed to pick up the refraction changes in light. When different gases (like helium or sulfur hexfluoride) are introduced at different temperatures, the way light passes through them
