Topological Material Switched off and on for the 1st time

his is an Na3Bi structure shown with sodium atoms white and bismuth atoms blue.
Credit: FLEET

This is an Na3Bi structure shown with sodium atoms white and bismuth atoms blue.
Credit: FLEET

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only 2 years ago, that there are two types of insulators: normal insulators which don’t conduct electricity, and topological insulators – newly discovered materials that conduct electricity only on their edges.

Now, FLEET researchers at Monash University, Australia, have for the first time successfully ‘switched’ a material between these two states of matter via application of an electric-field. This is the first step in creating a functioning topological transistor – a proposed new generation of ultra-low energy electronic devices.

Ultra-low energy electronics such as topol...

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Regrowing Damaged Nerves Hinges on Shutting Down Key Genes


Mouse neurons are shown with the cell bodies in the center and long tendrils radiating outward. Valeria Cavalli, PhD, of Washington University School of Medicine in St. Louis, used such neurons to study how cells regrow after injury. Her findings could one day lead to better treatments for spinal cord injury.

Injured neurons temporarily revert to immature state. Neurons in the brain and spinal cord don’t grow back after injury, unlike those in the rest of the body. Cut your finger, and you’ll probably be back to using it in days or weeks; slice through your spinal cord, and you likely will never walk again.

Now, working in mice, researchers at Washington University School of Medicine in St...

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NASA’s Voyager 2 Probe enters Interstellar Space


 Position of NASA’s Voyager 1 and Voyager 2 probes, outside of the heliosphere, a protective bubble created by the Sun that extends well past the orbit of Pluto. Voyager 1 exited the heliosphere in August 2012. Voyager 2 exited at a different location in November 2018.
Credit: NASA/JPL-Caltech

For the second time in history, a human-made object has reached the space between the stars. NASA’s Voyager 2 probe now has exited the heliosphere – the protective bubble of particles and magnetic fields created by the Sun.

Comparing data from different instruments aboard the trailblazing spacecraft, mission scientists determined the probe crossed the outer edge of the heliosphere on Nov. 5...

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What’s behind Mediterranean Diet and Lower Cardiovascular Risk?

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Assessment of Risk Factors and Biomarkers Associated With Risk of Cardiovascular Disease Among Women Consuming a Mediterranean DietJAMA Network Open, 2018; 1 (8): e185708 DOI: 10.1001/jamanetworkopen.2018.5708

Investigators identify, assess underlying mechanisms that may explain diet’s 25% reduction in cardiovascular risk for American women. A new study by investigators from Brigham and Women’s Hospital, Harvard Medical School, and the Harvard T.H. Chan School of Public Health offers insights from a cohort study of women in the U.S. who reported consuming a Mediterranean-type diet. Researchers found a 25 percent reduction in the risk of cardiovascular disease among study participants who consumed a diet rich in plants and olive oil and low in meats and sweets...

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