After the confusion of 2020, the WHO has finally changed its definition of how diseases can spread through the air. But what is the new definition—and what should happen next?
The Food and Drug Administration (FDA) plans to ban the use of formaldehyde as an ingredient in chemical hair straightening products, also known as relaxers.
Researchers estimated that vaccination programs against 14 pathogens prevented about 154 million deaths from June 1974 to May 2024; this included 146 million averted deaths among children under five.
