In many Kenyan homes, a cough rarely goes unanswered. “Umekunywa dawa?” someone will ask — Have you taken medicine? But the “medicine” in question is rarely a pill. Often, it is a homemade blend of ...

Mosquitoes haven’t always had a taste for human blood — partly because the tiny yet dangerous insects have been around a lot longer than humans. Pinpointing when mosquitoes shifted their preference to ...