Nitazenes and xylazine: what’s behind the rise of dangerous synthetic drugs?

Mistakes, fakes, and a giant rat penis: why are so many science papers being retracted?

How green are electric cars?

The debilitating impact of tinnitus, and how a new app could help

The Guardian’s new podcast series about AI: Black Box – prologue

Classic older child? What the science says about birth order and personality

What’s behind the rapid rise of cancer in the under-50s?

Why do we lose our hair as we age, and what can we do about it? – podcast

A waterworld with a boiling ocean and the end of dark matter? The week in science

Should forests have rights?