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I test mattresses for a living—these are the Memorial Day deals I’d shop

It’s the best time to buy a mattress—and these sales are actually worth shopping.
Science Daily

Cheaper than lithium, just as powerful — Sodium batteries are finally catching up

The method is well known in other areas of materials science but had not previously been used for solid electrolytes, Oh said. That practical familiarity could make it easier to transition the ...