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From Quantum Diaries: "Spun out of proportion: The Proton Spin Crisis"

Ricky Nathvani

We’ve known about the proton’s existence for nearly a hundred years, so you’d be forgiven for thinking that we knew all there was to know about it. 2,369 more words

Basic Research

Desired Outcome Of Learning

If ever someone asks me what is the desired outcome of learning, I would point her or him to this post:


Does (Brown and Batygin's) Planet 9 (or Planet X) Exist?

What exactly is the evidence that there may be a “Super-Earth” lurking in the outer reaches of the Solar System?  Accounts differ, so I’ll review what I’ve read (ignoring the mainstream media storm around 20th January!), to try to minimise confusion. 1,641 more words


After gravity-wave rumors, it's go time for LIGO

The scientists behind the Advanced Laser Interferometer Gravitational-Wave Observatory are getting ready to reveal their latest findings, amid a flurry of speculation over whether or not they’ve made the first-ever detection of waves rippling through spacetime. 125 more words


Understanding the Motion of Coupled Pendula

At A-level you consider the simple pendulum when studying simple harmonic motion.  You derive that if no resistive or driving forces act on the pendulum then its equation of motion is given by… 584 more words



What is the difference between Longitudinal and Transverse Waves?

In a longitudinal wave, the motion of the medium is parallel to the direction of the wave.  110 more words