This is the difference between low kinetic energy (top) and high kinetic energy (bottom), as illustrated in the 1956 Disney book Our Friend the Atom. It may be useful in visualizing some of the ideas presented in my recent feature on space radiation.

From Fresh Photons, a fantastic blog chock full of science pictures.

In 1879, Jean-Henri Fabre wrote a book about insects called Souvenirs entomologiques. Today it's considered a classic of entomology. An English translation, with some absolutely beautiful illustrations like the cicadas pictured above, was published in 1921.

You can read the full book online for free. Yes, both versions. The original French work is available at Gallica. Meanwhile, you can read the full English version at Google Books. Very neat!

I love this Map of Physics that turns an entire academic discipline into a fictional country, showing the way different sub-disciplines interact and the concepts that connect seemingly disparate discoveries.

Posted by Frank Jacobs at The Big Think, it dates to 1939. I'm not sure who or what originally made it (maybe one of you know) but it's great.

The map is more than a random representation of the different fields of physics: by displaying them as topographical elements of the same map, it hints at the unified nature of the subject. “Just like two rivers flow together, some of the largest advances in physics came when people realised that two subjects were [like] two sides of the same coin”, writes Jelmer Renema, who sent in this map.

Some examples: “[T]he joining of astronomy and mechanics […] by Kepler, Galileo and Newton (who showed that the movement of the Moon is described by the same laws as [that of] a fallling apple.” At the centre of the map, mechanics and electromagnetism merge. “Electromagnetism [itself is] a fusion between electricity and magnetism, which were joined when it was noted by Oersted that an electric current produces a magnetic field, and when it was noted by Faraday that when a magned is moved around in a wire loop, it creates a current in that loop.”

Read the rest and see some close ups of various corners of the Land of Physics at The Big Think blog