Metallic glass nanorods, shown here, are fabricated by sputtering, using a self-shadowing mechanism. A vast range of chemical compositions can be realized with this method, over large macroscopic areas.
Dr. Francis Kateh receives an experimental Ebola vaccine as part of a
clinical trial that began in Liberia in February 2015. With the number
of new cases falling, some experts say it may be too late to gather
useful scientific data about potential Ebola drugs and vaccines.
The crash of meteors on early Earth likely generated hydrogen cyanide,
which could have kick-started the production of biomolecules needed to
make the first cells.
Earth's atmosphere, here in light blue, acts like the window on a glass greenhouse. Some gases - such as CO2 - trap certain wavelengths of light (here shown in red). That trapped energy, or heat, warms our planet.
Today, astronomers read the history of the universe by looking at the light emitted by hot, distance objects. Sometimes, however, those light sources give out - and their light disappears. Good news: A new technique might be able to still read the information that had been carried in that long-gone light.
In the five years since its introduction, the tablet computer has become a part of the lives of hundreds of millions of people, young and old. A new study finds reading on them before bedtime can hurt our sleep.