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).

Focus

Fickle Magnet Switches Poles Twice

February 10, 1999

FOCUS

Stopping Sound with Foam

April 11, 2014

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