Alexander Hellemans

Alexander Hellemans is a freelance science writer in Naples, Italy, and a contributor to the upcoming book 30-Second Quantum Theory (Icon Books, June 2014).

Alexander Hellemans Published April 11, 2014

Metamaterials | Acoustics

Liquid foams can completely block ultrasound transmission of some frequencies, suggesting that foams are metamaterials that could be used for acoustic insulation.