Researchers at Caltech, the Jet Propulsion Laboratory, the Honda Research Institute, and Lawrence Berkeley National Laboratory and others are working together to develop rechargeable batteries based on fluoride, the anion (negatively charged form) of elemental fluorine. Fluoride batteries can have a higher energy density, which means that they may last longer—up to eight times longer than batteries in use today. But fluoride is corrosive and reactive. Iron fluorides already have more than double the lithium capacity of traditional cobalt- or nickel-based cathodes. Iron is 300 times less expensive than cobalt and 150 times less costly than nickel. Researcher team made
Screenshot: Warner Bros. Bad news for Max subscribers who’ve made re-watching The Lord of the Rings extended editions an annual New Year tradition: the third film in the trilogy, The Return of the King — which just celebrated its 20th anniversary! —is only available to stream in its theatrical version. No ancient evil is to blame, thankfully; it’s an unspecified “tech issue,” according to a Max spokesperson who responded to a comment request from Vulture after the issue was noted by dismayed fans on Reddit . The fact that The Return of the King extended edition is merely temporarily unavailable is actually good news given Max’s track record for removing content in the past, and the explanation makes sense considering The Fellowship of the Ring and The Two Towers remain available in both their theatrical and extended editions. The Max spokesperson assured Vulture that The Return of the King extended edition will be, ah, returning soon to the service, though as of this writing i...
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