Well it's not antigravity but this sound-blocking tube might help make ducted fa...

		DennisP on March 18, 2019 \| parent \| context \| favorite \| on: Nike and Boeing Are Paying Sci-Fi Writers to Predi... Well it's not antigravity but this sound-blocking tube might help make ducted fans quieter: https://www.fastcompany.com/90316833/scientists-have-discove...