Science & Technology

The outcome of a duel between mathematical models supports the reigning theory of the genetics of altruism. Called inclusive fitness, it says altruism is competitive if it benefits relatives carrying the same gene as the selfless individual. Attacked by a Nature article published in 2010, it is defended by Washington University evolutionary biologist David Queller.

There are five regular polytopes (Platonic solids) in three-dimensional space and six in four-dimensional space. Only their projections can be built in our dimension-deficient world and that requires an act of imagination. Ivan Horozov, PhD, the Chauvenet Lecturer in Mathematics, is building the two most complex figures in this office in his spare time.

​Ireland lost 1 million souls to hunger and disease during the potato famine and another million to immigration. But that’s not all, says Peter Wyse Jackson, PhD, president of the Missouri Botanical Garden and the George Engelmann Professor of Botany at Washington University in St. Louis. Ireland also lost its connection to the many plant species that sustained its people throughout the centuries. The ethnobotanist says the study of plants is more important than ever.

Isotopic analysis of animal teeth from a 2,000-year-old herding settlement near Lake Victoria in southern Kenya show the area was once home to large grassland corridors — routes that could have been used to dodge tsetse flies and bring domesticated livestock to southern Africa.

​​​​​Every austral summer, a group of volunteers heads off to a remote region of Antarctica to set up a field camp on the ice. For the next month, they search the ice and nearby glacial moraines for dark rocks that might be extraterrestrial in origin. Research scientist Christine Floss describes this year’s trip, which included a record-setting day. ​

In the quantum world, the future predicts the past. Playing a guessing game with a superconducting circuit called a qubit, a physicist at Washington University in St. Louis has discovered a way to  narrow the odds of correctly guessing the state of a two-state system. By combining information about the qubit’s evolution after a target time with information about its evolution up to that time, the lab was able to narrow the odds from 50-50 to 90-10.

Why do so many of us cry at the movies? Why do we flinch when Rocky Balboa takes a punch? What’s really happening in our brains as we immerse ourselves in the lives being acted out on screen? These are the questions that Washington University in St. Louis neuroscientist Jeffrey M. Zacks, PhD, explores in his new book, “Flicker: Your Brain on Movies.”

Beavers don’t brush their teeth, and they don’t drink fluoridated water, but a new study reports beavers do have protection against tooth decay built into the chemical structure of their teeth: iron. The research team, which was led by scientists from Northwestern University, included Jill D. Pasteris, PhD, professor of earth and planetary sciences in Arts & Sciences.

It’s been more than 40 years since astronauts returned the last Apollo samples from the moon, and since then those samples have undergone some of the most extensive and comprehensive analysis of any geological collection. A team of scientists has now refined the timeline of meteorite impacts on the moon through a pioneering application of laser microprobe technology to Apollo 17 samples.

Pathogens, pesticides and nutritional deficits have previously been identified as stressors linked to colony collapse disorder, but it was a mystery why bee colonies sometimes collapsed so rapidly, leaving bee keepers with an empty hive box. A new study suggests that when a colony is stressed, young bees are forced to become foragers much sooner than they otherwise would and this accelerated development leads to their early death.