https://www.youtube.com/watch?v=eH4i4I3qfw8
https://interestingengineering.com/this-new-type-of-aluminum-could-be-the-lightest-in-the-world A team of materials science engineers just created a new form of aluminum with an exceptionally low density so that it could easily float in water. via This New Type of Aluminum Could be the Lightest in the World.