Elon Musk talks about the development towards
electric aircraft and mentions by the way... 
"Where we are right now is a little over 300 Wh/kg"
@ajtourville @alex_avoigt @Kristennetten @28delayslater @flcnhvy @TilmanWinkler @HogDexter @nextmove_depic.twitter.com/lLwprUIPXK
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First principles is easy to talk about. The challenge is to realize it, the cutting edge research and engineering.
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sure, but it's a good starting point
End of conversation
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