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I think that this is very cool. It's an exobiology web-magazine, sponsored by NASA, covering all aspects of exobiology at approximately a university undergraduate level, with free content that can be read online.

http://www.astrobio.net/

It a huge number of articles on the origins of life, life in extreme environments, solar system planetology, exoplanets, space missions, and more.

Here's their articles on the origin and evolution of life. There are hundreds of these alone.

http://www.astrobio.net/origin-and-evolution-of-life/

Here's Comparative Planetology

http://www.astrobio.net/comparativeplanetology/

There's lots more where that came from. Check it out.

Quote:Hostage situation or harmony? Researchers rethink symbiosis
Jul 30, 2017
A new study shows that, when it comes to certain microorganisms, symbiotic partners are actually being held "hostage".

Thanks. Looks interesting. Don't know why I was surprised to see recent items, when it's a magazine (for Pete's sake).