Why we may still be choosing our friends like it's the Stone Age

friendship
Credit: Yusron El Jihan from Pexels

Choosing friends may involve more than clicking with others who share our interests or outlooks. According to new research, people may select friends based on traits that made them valuable survival partners in our evolutionary past.

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Ross Johnson

Ross Johnson

Freelance Writer

Experience

Ross Johnson writes about television, film, and literature for Lifehacker. He has a degree in political science from the University of Rochester and has previously been a legal writer and editor for Thomson Reuters, for which he later traveled around India and the Middle East as an educator specializing in American English style and grammar for adults.

World-first neutron lens brings sharp focus to structures inside materials and objects

A sharper view from meters away: This magnified neutron image of a 3 millimeter PSI logo was acquired using the new achromatic neutron lens, with the logo placed six meters from the detector. Without the lens, comparable resolution would require the object to be placed within centimeters—or even millimeters—of the detector. Credit: Paul Scherrer Institute/Mano Raj Dhanalakshmi Veeraraj

Researchers at Paul Scherrer Institute (PSI) have developed the world's first achromatic lens for neutron imaging. The lens overcomes a longstanding obstacle in the field: focusing neutrons of different wavelengths well enough to form a sharp, magnified image. With the lens, researchers can now image thick samples and follow processes inside bulky equipment such as furnaces, cryostats or pressure cells.