A fasting prime minister and a mind-reading billionaire: the week in science

What happens now bird flu has reached the Antarctic?

Why are we still waiting for a male contraceptive pill?

Retinol, acids and serums for kids? A dermatologist’s guide to age appropriate skincare

What apes can tell us about the origins of teasing

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