Bird flu has been invading the brains of mammals. Here’s why
Strange observations of galaxies challenge ideas about dark matter
A stellar explosion may create a temporary ‘new star’ this summer
Breastfeeding should take a toll on bones. A brain hormone may protect them
Bird flu viruses may infect mammary glands more commonly than thought
A heat dome is baking the United States. Here’s why that’s so dangerous
The universe may have a complex geometry — like a doughnut
Astronomers watch a supermassive black hole turn on for the first time
