What makes ‘junk food’ junk?

How is ‘junk food’ defined for food policies like taxes? A combination of food category, processing, and nutrients can determine which foods should be subject to health-related policies, according to a new analysis examining three decades of U.S. food …

Paradoxical quantum phenomenon measured

The information contained in a book depends on its volume — not merely on the area of the book’s cover. In the quantum world, however, information is often closely linked to surface area. This strange and counter-intuitive fact has been theoretically …

Tunneling electrons

By superimposing two laser fields of different strengths and frequency, the electron emission of metals can be measured and controlled precisely to a few attoseconds. Physicists have shown that this is the case. The findings could lead to new quantum-m…

Immune system sculpts rat brains during development

Researchers have identified the mechanism for why and how one brain region differs in size between male and female rats. The study found that immune system cells in the brains of females consume and digest neurons to sculp a region of the brain during …

Humidity may increase heat risk in urban climates

A new study investigated the combined effect of temperature and humidity on urban heat stress using observational data and an urban climate model calculation. Researchers found that the heat stress burden is dependent on local climate and a humidifying…