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LED light wands, or light sticks, provide an effective (and relatively affordable) alternative to a photographer’s flashgun or a videomaker’s stand-mounted lamp. You don’t need to sync a light wand ...

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Copper is widely used in electrical systems, for wiring and motors. It’s also used as an alloy for coinage and weapons ... the price of neodymium is likely to increase. Europium glows red under UV ...