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AK Press has made the following ebooks available for free for the time being:
- "The Nation on No Map: Black Anarchism and Abolition" by William C. Anderson
- "As Black as Resistance: Finding the Conditions for Liberation" by Zoé Samudzi and William C. Anderson
- "Our Enemies in Blue: Police and Power in America" by Kristian Williams
https://www.akpress.org/featured-products/featured-topic-free-ebook.html
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Popular science article on quark-quark bonds & how they might act in NUCLEI. Typically QCD potentials are far too short-range to act over nuclear length scales, however, due to the uncertainty principle of quantum physics, they *can* act on quarks from different nucleons. Next question - is the potential strong enough to overcome the uncertainty principle, for a moment? The binding energy of the diquark state must be large - things look good. Nature to decide:
In the early morning hours of October 6, 1923, Edwin Hubble took a photo plate of M31 showing a Cepheid variable star. He originally mistook it for a nova - you can see where he has crossed out an “N” on the plate and excitedly replaced it with “VAR!”
Applying Henrietta Swan Leavitt’s period-luminosity relationship to subsequent observations, Hubble concluded that the distance to M31 was greater than reliable size estimates for the Milky Way.
Image: Carnegie Observatories