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Scientists 3D-print graphene foam, a first

Science
June 21 (UPI) -- A team of researchers from Texas and China have managed to create graphene foam using a 3D printer. The production method could eventually yield commercial quantities of the material.Graphene's benefits have been well-documented by material scientists. The atomically thin carbon sheets are exceptionally strong, flexible and conductive. But producing graphene in bulk has proven difficult, limiting its potential use in commercial technologies -- whether they be medical implants or smartphones.Scientists at Rice University and China's Tianjin University, however, have found a way to turn nongraphene starting materials into graphene foam using a 3D printer. Researchers detailed their breakthrough in the journal journal ACS Nano."This study is a first of its kind," Rice chemist...

Mars Orbiter spots rover ascending Mount Sharp

Science
June 21 (UPI) -- In an image captured by NASA's Mars Reconnaissance Orbiter, the Martian rover Curiosity can been seen as a bright blue speck ascending the rocky terrain of Mount Sharp.The image was taken by the orbiter's High Resolution Imaging Science Experiment camera on June 5 and shared online this week.Curiosity spent the end of last month and early June exploring active sand dunes among the mountain's lower elevations. In the newly released image, the rover can been seen en route to Vera Rubin Ridge.Once at Vera Rubin Ridge, the rover will investigate rock outcrops where the signature of hematite, a type of iron oxide, has been identified by the infrared spectrometers during previous Martian probe missions.On August 5, Curiosity will celebrate the five-year anniversary of its landin...
Why suitcases rock and fall over – puzzle solved

Why suitcases rock and fall over – puzzle solved

Science
It's a common experience when dashing for a train or plane while lugging a two-wheeled suitcase. The bag rocks alarmingly from side-to-side and threatens to overturn. Now, scientists have investigated this conundrum of everyday physics. Speeding up rather than slowing down can solve the problem, they say. Alternatively, you can pivot the handle of the suitcase as close to the ground as possible. French scientists studied a model suitcase on a treadmill to see what goes wrong when a suitcase rocks out of control at high speed. They developed equations to explain why two-wheeled trolleys have a tendency to rock from one wheel to the other. In cases of unstable bags - after having gone over a bump, for example - they found luggage rocks from side-to-side until it falls over, or it reach...
Europe selects grand gravity mission

Europe selects grand gravity mission

Science
It is set to be one of the major science projects of the 2030s. The European Space Agency has just given the green light to the LISA mission to detect gravitational waves. This will see lasers bounced between three identical satellites separated by 2.5 million km. By looking for tiny perturbations in these light beams, the trio hope to catch the warping of space-time that is generated by cataclysmic events such as the merger of gargantuan black holes. Ground-based laboratories in the US have recently begun detecting gravitational waves from coalescing objects that are 20-30 times the mass of our Sun. But by sending an observatory into space, scientists would expect to discover sources that are millions of times bigger still and to sense their activity all the way out to the edge of the ob...
How cats conquered the ancient world

How cats conquered the ancient world

Science
The domestic cat is descended from wild cats that were tamed twice - in the Near East and then Egypt, according to the largest study of its kind.Farmers in the Near East were probably the first people to successfully tame wild cats about 9,000 years ago.Then, a few thousand years later, cats spread out of ancient Egypt along maritime trade routes.Today, cats live on all continents except Antarctica. Scientists think wildcats began hanging around farms to prey on mice attracted to grain stores, starting the long relationship between humans and felines."There were two taming events - one in the Near East at the beginning and one in Egypt much later," said lead researcher Eva-Maria Geigl."And then the cat spread very efficiently all over the ancient world as a ship's cat. Both lineages are no...