
The Grand Duke Francesco de Medici, a prominent politician in the Tuscany region of Italy in the 16th century, died under mysterious circumstances in 1587 – with the suddenness of his death giving rise to rumors that he’d been poisoned. According to historical documents, Francesco’s brother and political rival, Cardinal Ferdinando de Medici, was the prime suspect, especially as Francesco’s wife, Bianca Cappello, also died within a day of her husband. In a new study published in iScience, researchers from Yale University in the US and the University of Pisa in Italy have confirmed the real killer. The team analyzed genetic material extracted from the skeletal remains of Francesco de Medici to find two species of Plasmodium parasites, single-celled organisms known as protozoans that cause malaria and are spread by mosquitoes. Malaria was widespread in central Italy for centuries, so the clues stack up. (via Science Alert)
Researchers show that living in an area with mountain lions makes driving safer

Hearing the roar of a mountain lion in the distance while you’re just outside your house might sound scary. Yet living in an area inhabited by these large predators might actually make you safer. Every year in the U.S., deer are involved in more than 1.5 million collisions with vehicles, resulting in the death of more than 200 people, tens of thousands of injuries and billions of dollars in damages. The team of scientists behind the new study, published on Wednesday in Current Biology, wanted to see whether pumas could play a role in decreasing those numbers. The researchers analyzed data from 503 camera traps and 59 GPS collars tracking pumas’ presence in Washington State’s Olympic Peninsula between 2020 and 2025. They also looked at data on the distribution and behavior of black-tailed deer and elk in the landscape and on collisions between vehicles and the animals. In those five years, the deer and elk were involved in more than 950 collisions with vehicles on the peninsula. (via Scientific American)
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