Surprising as it may sound, 107 years after the introduction of general relativity, the meanings of basic concepts are still being worked out. More than a century after Albert Einstein unveiled ...

In an introductory physics course, there are three big ideas. There is the work-energy principle, the momentum principle and then the angular momentum principle. I'll skip the work-energy principle ...

Angular momentum is a fundamental quantity in physics that describes the rotational motion of objects. In quantum physics, it encompasses both the intrinsic spin of particles and their orbital motion ...

You need to be in the air long enough for the bike person to make three complete rotations. How do you do that? Go fast, and go high. The higher you go, the longer you are in the air. Suppose you ...

If you want to know where something is, you just measure it to greater and greater accuracy. Rulers can give way to calipers, microscopes, and even individual particles of light of ever-shorter ...

Pseudospin, an additional degree of freedom inherent in graphene, plays a key role in understanding many fundamental phenomena such as the anomalous quantum Hall effect, electron chirality and Klein ...

Six photons: physicists in China have entangled photons in terms of polarization, position and orbital angular momentum. (Courtesy: iStock/CopterAnansak) Physicists in China have fully entangled 18 ...