The Physics arXiv blog.
My  most favourite blog is by far that from the Technology Review: "The  Physics arXiv blog". Some very interesting topics below: 
- Mathematical Model Computes Snow Flake Shapes for the First Time
 
- Self Portrait of Young Leonardo da Vinci
 
- How Neutrino Beams Could Reveal Cavities Inside Earth
 
- Electron Holography Produces First Image of a Single Protein
 
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| Holography of a Protein Molecule | 




