Jumbo jets arrived to evacuate US citizens from the Diamond Princess cruise ship, with people quarantined onboard due to fears of the new COVID-19 coronavirus, at the Haneda airport in Tokyo on February 16, 2020. - The number of people who have tested positive for the new coronavirus on a quarantined ship off Japan's coast has risen to 355, the country's health minister said. (Photo by Kazuhiro NOGI / AFP) (Photo by KAZUHIRO NOGI/AFP via Getty Images)
Enlarge / Jumbo jets arrived to evacuate US citizens from the Diamond Princess cruise ship, with people quarantined onboard due to fears of the new COVID-19 coronavirus, at the Haneda airport in Tokyo on February 16, 2020. – The number of people who have tested positive for the new coronavirus on a quarantined ship off Japan’s coast has risen to 355, the country’s health minister said. (Photo by Kazuhiro NOGI / AFP) (Photo by KAZUHIRO NOGI/AFP via Getty Images)

Health officials at the US Centers for Disease Control and Prevention did not want 14 people who had tested positive for

Image of a collection of ancient skulls.
Enlarge / OK, which one of you is the father?

Shortly before the publication of the first Neanderthal genome, a number of researchers had seen hints that there might be something strange lurking in the statistics of the human genome. The publication of the genome erased any doubts about these hints and provided a clear identity for the strangeness: a few percent of the bases in European and Asian populations came from our now-extinct relatives.

But what if we didn’t have the certainty provided by the Neanderthal genome? That’s the situation we find ourselves in now, as several studies have

Passengers use mobile stairs to exit and jet plane at night.
Enlarge / SAN ANTONIO, TX – FEBRUARY 17: American evacuees from the Diamond Princess cruise ship arrive at Joint Base San Antonio-Lackland on February 17, 2020, in San Antonio, Texas. The Diamond Princess cruise ship where the passengers were evacuated from, docked at the Japanese city of Yokohama, is believed to be the highest concentration of novel coronavirus cases outside of China, where the outbreak began.

Fourteen Americans tested positive for carrying the new coronavirus just as they began their return to the United States from Yokohama, Japan, where they had been trapped aboard the luxury cruise ship Diamond Princess

Cartoon of the Sun, Earth, and Jupiter, with a diffuse collection of asteroids.

Despite its distance from the Sun, the asteroid belt will disintegrate as it expands.

We tend to view the bodies of the Solar System as creations of gravity, which pulled their parts together and holds them in place as they orbit. But as we saw with ideas about the formation of Arrokoth, there are lots of situations where gravity is essentially a constant for long periods of time. And given enough of that time, relatively small forces like friction from sparse gas clouds or pressure from the light of the Sun can add up and create dramatic changes. In

Migrating geese fly in a V shape.

Even though it was, in most ways, identical to the present planet, the Earth still looked very different at the bottom of the last ice age 20,000 years ago. The globe was around 4°C cooler on average, and ice sheets covered large portions of the Northern Hemisphere, including Canada and Scandinavia. One thing you might wonder, given how much of the planet was barely habitable, is what migratory species did.

Given the loss of all that habitat to mile-thick glacial ice and a reduced winter-summer contrast courtesy of Earth’s orbital cycles, some researchers have hypothesized that bird migration wasn’t

Studying how ants organize division of labor within a colony can lend insight into how political polarization occurs in human society.
Enlarge / Studying how ants organize division of labor within a colony can lend insight into how political polarization occurs in human society.

Ants may be tiny critters with tiny brains, but these social insects are capable of collectively organizing themselves into a highly efficient community to ensure the colony survives. And it seems that the social dynamics of how division of labor emerges in an ant colony is similar to how political polarization develops in human social networks, according to a recent paper in the Journal of the Royal Society Interface.

“Our findings suggest that division of labor and