A friend on Facebook posited: The existence of other Earth-like planets depends on their microorganisms developing photosynthesis -- not a sure thing by any means. There are lots of chemical ways of making a living. So if only our bacteria evolved photosynthesis then Earth is the only planet in the 'verse with an oxygen atmosphere. I provided the following explanation of the subtleties that attended the invention of photosynthesis during Earth's history.... "The existence of other Earth-like planets depends on their microorganisms developing photosynthesis." That's mostly true, though it depends on how you classify "Earth-like" do you mean as it is now? Or as it was say 3 billion years ago when the atmosphere was devoid of oxygen, or a billion years later where it was very different from a billion before but still devoid of oxygen...or 300 million years ago when Oxygen percentages were significantly higher than they are today? But that's not ...
A chronicle of the things I find interesting or deeply important. Exploring generally 4 pillars of intense research. Dynamic Cognition (what every one else calls AI), Self Healing Infrastructures (how to build technological Utopia), Autonomous work routing and Action Oriented Workflow (sending work to the worker) and Supermortality (how to live...to arbitrarily long life spans by ending the disease of aging to death.)