Traditional flush toilets aren’t an option in many parts of the world, but neither is leaving people with unsafe and unhygenic choices. Lina Zeldovich travels to Madagascar to witness the start of a lavatorial revolution.
To fight malaria, researchers are reviving a field of study grounded in both music and biology: wingbeat frequency. Daniel A Gross traces the story from Finland to Tanzania, and looks at where this collision of disciplines could lead.
How a research team identified parasites in 'hygiene sticks' that travellers on the Silk Road effectively used as their toilet paper.