


A demon of a puzzle
We celebrate the 150th anniversary of James Clerk Maxwell proposing the puzzle now known as “Maxwell’s Demon” in a thermodynamics-themed cryptic crossword

Golden eclipse wins Astronomy Photographer of the Year, dancing atoms and molecules, tactile illusions
Excerpts from the Red Folder

Music inspired by black holes, book encourages children to listen to the universe
Excerpts from the Red Folder

Physics explains why humans can walk through crowded places and not spill their coffee
Excerpts from the Red Folder

Physics for better swimming and judo, solar-flare radiation risk on aircraft
Excerpts from the Red Folder

Why open-source software is so powerful for physics: find out in the September 2021 issue of Physics World
Find out why physics is increasingly reliant on open-source code by checking out the September 2021 issue of Physics World magazine

Wooden satellite to launch in 2023, glowing thread is made from wood
Excerpts from the Red Folder

The physics of rollercoasters
Virtual reality technologies are bringing new experiences for thrill-seekers

We’re all going on a geeky holiday
Science-themed vacations are gaining in popularity: hear from people who have caught the geek travel bug