Invisible to the naked eye, we are almost always surrounded by small particles suspended in the air. They are known as atmospheric aerosols and can be made of directly emitted particles like dust, sea salt, and viruses; or formed in the atmosphere out of molecules... click to read more

Why do we spend a third time of our lives sleeping? Why do all animals with a nervous system sleep? And how can we define sleep in all species? From jellyfish to mice to humans, all animals sleep despite the risk of predation and survival.... click to read more

A fundamental and often neglected feature of life on Earth is that all organisms live immersed in fluids. In the case of animals that fly or swim, locomotion is, therefore, a combination of their own movement and the displacements of the surrounding air or water.... click to read more