Boing Boing
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Solar furnace melts rock

In this clip from BBC One's "Bang Goes the Theory," a clip of a high-performance solar furnace that can focus normal sunshine into a heat-ray that reaches 3,500C, hot enough to melt rocks.

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Jem Melts Rock Using Sunshine - Bang Goes The Theory - Series 3, Episode 5 Preview - BBC One

(Thanks, Fipi Lele!)

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