Remember that school-room lesson on invisible forces where the teacher sprinkles iron filings over a sheet of paper that is placed over a magnet? Here's a complete upgrade. Watch these magnetic field patterns in 3D, created when magnetite sand is thrown on magnets – some of them bouncing on a small trampoline – and shot in slow motion. Beautifully captivating.
Via Gizmodo
from Boing Boing http://bit.ly/2Stj90v
via IFTTT
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