Science & Technology

A levitated droplet during heating by a laser to just above the melting temperature.Using the Electrostatic Levitator at NASA’s Marshall Space Flight Center, a physicist at Washington University in St. Louis led a research team that validated a 50-year-old hypothesis explaining how liquid metals resist turning into solids. The research, led by Ken Kelton, Ph.D., a professor of physics in Arts & Sciences at Washington University, is featured in the July 2003 issue of Physics Today, including an image on the magazine’s cover of a solid drop of metal suspended inside the levitator. The NASA-funded research challenges theories about how crystals form by a process called nucleation, important in everything from materials to biological systems.”Nucleation is everywhere,” says Kelton. “It’s the major way physical systems change from one phase to another. The better we understand it, the better we can tailor the properties of materials to meet specific needs.”

Using the Electrostatic Levitator at NASA’s Marshall Space Flight Center, a physicist at Washington University in St. Louis led a research team that validated a 50-year-old hypothesis explaining how liquid metals resist turning into solids. The research, led by Ken Kelton, Ph.D., a professor of physics in Arts & Sciences at Washington University, is featured in the July 2003 issue of Physics Today and includes an image on the magazine’s cover of a solid drop of metal suspended inside the levitator. The NASA-funded research challenges theories about how crystals form by a process called nucleation, important in everything from materials to biological systems.

Erik Trinkaus, professor of anthropology in Arts & Sciences, examines a Neandertal skull.New scientific evidence challenges a common perception that Neandertals — a close evolutionary relative to modern humans that lived 230,000 to 30,000 years ago — possessed exceptionally long faces. Instead, a report authored by Erik Trinkaus, Ph.D., the Mary Tileston Hemenway Professor of anthropology in Arts & Sciences at Washington University in St. Louis, shows that modern humans are really the “odd man out” when it comes to facial lengths, which drop off dramatically compared with their ancestral predecessors.

Photo by Patrick ShoreAnatahan eruption yields spectacular images, seismic data trove.Washington University geophysicists were fortunate to observe the May 10 eruption of a long dormant volcano on the uninhabited island Anatahan, part of the U.S.-administered Commonwealth of the Northern Marianas in the western Pacific. A seismograph they deployed there only a few days before the unexpected eruption has captured a trove of important seismic data — a detailed chronology of pre- and post-eruption rumblings. While the team’s primary focus is exploring the tectonic forces in the region, the chance capture of detailed volcanic eruption data may offer new avenues of research, perhaps providing tools to help access volcanic and seismic hazards to the people of the Marianas.

TempletonThe notion of race in humans is completely a social concept without any biological basis, according to a biologist at Washington University in St. Louis. There are not enough genetic differences between groups of people to say that there are sub-lineages (races) of humans, said Alan R. Templeton, Ph.D., professor of biology in Arts & Sciences at Washington University in St. Louis. On the other hand, there are different races in many other species, including chimpanzees, our closest evolutionary relatives. Templeton was part of a recent St. Louis panel discussion that previewed the first episode of the National Public Television’s “Race: The Power of an Allusion” series running nationally on May 4, 11, and 18 (check local stations for times).

Viewers will be treated to a lunar eclipse May 15th.A total lunar eclipse of the moon will be visible from across North America late Thursday, but whether the moon turns red depends on the presence of tiny particles in the Earth’s upper atmosphere, says Richard Heuermann, Outreach Program Coordinator in the University’s Department of Earth and Planetary Sciences.

WillAn astrophysicist at Washington University in St. Louis is disputing the claim that measurements of light bending are useful for determining the speed of gravity.

Science & Technology Tip Sheet

Lewis the robotic photographerMay and June are prom, graduation and wedding months, times when the family camera gets a steaming workout. Computer scientists at Washington University in St. Louis can take that camera out of your designated photographer’s hands and perch it atop Lewis, the world’s first robotic photographer.

Valencius unearths a common theme among early settlers in *The Health of the Country*.Poring over stacks of yellowed aging letters and other documents from the 19th century while researching American western expansion, Conevery Bolton Valencius, Ph.D., an environmental historian at Washington University in St. Louis, noted a common theme. Assessments of the “sickliness” or “health” of land pervade settlers’ letters, journals, newspapers and literature from that time. Valencius says that the numerous references throughout 19th-century writings to “healthy country,” “sickly” countryside, or “salubrious” valleys reveal the importance settlers placed on the connections between their bodies and their land. One of the main criteria for choosing where to farm and where to raise a family for the early settlers was whether or not the area would be a healthy place to live.