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Tesla Shareholders Approve Musk's $56 Billion Pay Package in Early Voting
(www.ibtimes.co.uk)
This is a most excellent place for technology news and articles.
IIRC, the reason sodium batteries would be better is we have abundant stocks of sodium, whereas the raw materials for most other batteries are limited and require more destructive mining. John Oliver just covered some of this on his show last Sunday. If that tech can be improved, hopefully there won't be any deep sea mining for more raw materials!