In the womb, a brother's hormones can shape a sister's future

https://www.npr.org/sections/health-shots/2024/04/09/ [login to see] /siblings-womb-brothers-sisters-sex-hormones
The Science of Siblings is a new series exploring the ways our siblings can influence us, from our money and our mental health all the way down to our very molecules. We'll be sharing these stories over the next several weeks.