Discovery unravels how atomic vibrations emerge in nanomaterials: Advances in microscopy reveal source of phonons’ puzzling behavior
A hundred years of physics tells us that collective atomic vibrations, called phonons, can behave like particles or waves. When they hit an interface between two materials, they can bounce off like a tennis ball. If the materials are thin and repeating, as in a superlattice, the phonons can jump between successive materials. Now there […]
Long Lines For COVID-19 Vaccine In Nairobi, Few Takers In Atlanta
NAIROBI, Kenya (AP) — Several hundred people line up every morning, starting before dawn, on a grassy area outside Nairobi’s largest hospital hoping to get the COVID-19 vaccine. Sometimes the line moves smoothly, while on other days, the staff tells them there’s nothing available, and they should come back tomorrow. Halfway around the world, at […]