Testosterone is the primary male sex hormone and, in men, it plays a key role in the development of male reproductive tissues such as the testis and prostate, as well as promoting secondary sexual characteristics such as increased muscle and […]

Cows may help researchers develop vaccine for HIV
Cows’ immune systems show an extraordinary ability to neutralize HIV and may help researchers develop a vaccine for humans. Scientists say cows’ unique digestive system may play a role in their ability […]

Extended and refined by Bloch and others during the 1930s, Bloch’s theory, known as the band theory of solids, accounts very well for the conducting behaviour of materials. When atoms are joined together into a crystal, each of the individual […]

We’ve known for decades there was a time when mammoths, saber-tooth cats, and other big mammals walked the Earth like it was no big deal. We also know that at some point of the Ice Age, a mass extinction made […]

Ravens can pre-plan, barter for rewards
Ravens have the cognitive ability to plan ahead and barter for rewards. Researchers tested ravens in a series of experiments and found they performed better at those tasks than great apes or human children. […]

Topological insulators are electronic materials that have a bulk band gap like an ordinary insulator but have conducting states on their edge or surface. The conducting surface is not what makes topological insulators unique, but the fact that it is […]

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“Ashtekar’s formulation of general relativity taught us to think of gravitational theories as theories of connections, on a bare manifold with no metric structure. […] The idea that general relativity has its deepest formulation […]

NASA’s quieter supersonic jet zooms past milestone
A supersonic jet under development at NASA that would create a much quieter sound than the loud sonic booms produced by more conventional supersonic aircraft has passed a preliminary design review. The Quiet […]

For centuries, metals were employed in optical applications only as mirrors and gratings. New vistas opened up in the late 1970s and early 1980s with the discovery of surface-enhanced Raman scattering and the use of surface plasmon (collective electronic oscillations […]

When we talk about nucleic acids we generally think of DNA and RNA that code for proteins, and when we talk about brain cells we tend to think of neurons and their nerve impulse transmission. However, it is not news […]