GENOA, Italy, Sept. 21 (UPI) -- Coffee-infused foam sounds like the brainchild of a chef or barista, but it's actually the work of a team of materials scientists and chemical engineers. The foam doesn't go on top of a drink, but it can make water safe to drink -- that is if the water is contaminated with lead.
Previous experiments have shown powder made from spent coffee grounds can extract heavy metal ions from water. But removing the toxic powder from the water isn't easy.