Earlier this year, my colleagues at The New York Times started to report on a medical mystery that has turned into an international standoff. American diplomats in Cuba have fallen ill with a variety of perplexing symptoms, including — reportedly — some that might denote mild brain injury.

Continue reading “What’s a Science Reporter to Do When Sound Evidence Isn’t Sound?” →

A scientific enigma lies at the heart of a strange confrontation between the United States and Cuba.

According to the State Department, nearly two dozen diplomats at the American Embassy in Havana have been stricken with a variety of mysterious medical symptoms, including hearing loss and cognitive difficulties.

After concluding that staffers were the victims of a stealth attack, the department withdrew nonessential personnel from Havana and issued an advisory urging Americans not to visit. On Tuesday, the Trump administration expelled 15 Cuban diplomats from the United States.

Continue reading “A ‘Sonic Attack’ on Diplomats in Cuba? These Scientists Doubt It” →

In July, scientists reported that a strange protein courses through the veins of pregnant women. No one is sure what it’s there for.

What makes this protein, called Hemo, so unusual is that it’s not made by the mother. Instead, it is made in her fetus and in the placenta, by a gene that originally came from a virus that infected our mammalian ancestors more than 100 million years ago.

Hemo is not the only protein with such an alien origin: Our DNA contains roughly 100,000 pieces of viral DNA. Continue reading “Ancient Viruses Are Buried in Your DNA” →

It was only two years ago that researchers found the first ancient human genome in Africa: a skeleton in a cave in Ethiopia yielded DNA that turned out to be 4,500 years old.

On Thursday, an international team of scientists reported that they had recovered far older genes from bone fragments in Malawi dating back 8,100 years. The researchers also retrieved DNA from 15 other ancient people in eastern and southern Africa, and compared the genes to those of living Africans.

Their analysis, published in the journal Cell, reveals important clues to Africa’s mysterious prehistory, including details of massive migrations that shaped the populations we know today.

Continue reading “Clues to Africa’s Mysterious Past Found in Ancient Skeletons” →

Animals around the world are on the move. So are their parasites.

Recently, scientists carried out the first large-scale study of what climate change may do to the world’s much-loathed parasites. The team came to a startling conclusion: as many as one in three parasite species may face extinction in the next century.

As global warming raises the planet’s temperature, the researchers found, many species will lose territory in which to survive. Some of their hosts will be lost, too.

Continue reading “Climate Change Threatens the World’s Parasites (That’s Not Good)” →