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Yes, that’s the whole point of the article!

Sure, but they don't include that comparison, nor do they say in what way it is "revolutionary."

"This design produces more power while using less fuel than today’s propulsion systems" Okay, what's the exhaust velocity or Isp? Doesn't say!

You should email them and let them know how fucking stupid you're making them look on Hacker News.

They’re probably just happy the thing didn’t explode, which is what they mostly did the first few times anyone tried to build one.