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People who've had dose 1 are wondering ... can I have a few drinks before dose 2 or will that muck things up? Also: Do you really understand the concept of "vaccine efficacy"? It's complicated!

This week our readers have lots of — interesting — queries involving opening windows during winter in North Dakota, trying not to breathe during a micro-encounter and spraying a mask with ... oil?

They live in the lead-contaminated village of Kabwe, Zambia. A World Bank loan for lead cleanup offered reason for hope. A new report assesses the current situation.

It's hard tracking down data to see what progress is being made on the Sustainable Development Goals. Now there's a shiny new tool that does it for you.

A program in Ethiopia promises a farmyard incentive to families that don't marry off an underage daughter.

A study adds to evidence that it's a matter of blood and genes. "Hopefully, there will be huge medical implications," says one researcher.

A new report looks at the number of anesthesiologists around the world — and finds that many countries barely have 1 per 100,000. And some have ... zero.

There's plenty of evidence that being transgender makes for worse mental health. But would that change if trans people were accepted by their families early on? Scientists are trying to find out.

Zoo nutritionists these days have to do more than try to keep displayed animals happy and healthy. Sometimes the goal is to bring endangered wildlife back from the brink.

Tour de France cyclists need to eat up to 9,000 calories a day to maintain their health and weight during the race. But many teams hire chefs to elevate the meals to gourmet status.