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View Diary: A Perspective on Life on Earth (74 comments)

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  •  Enjoyed your perspective. I had my (7+ / 0-)

    Evolution class last spring create a timeline of the life of the Earth, which stretched 75 feet along an upper corridor in our building. Even I was taken aback by some of the intervals. The 10K years since the origin of agriculture was so close to the "NOW" that you could barely get the labels in.

    Couple of things: 20 amino acids, not 22, are universal, unless you know about some new research I don't. Also: the warming after that first snowball: could be the result of the rise of aerobes that produce CO2 as a byproduct of their metabolism?

    We all understand that freedom isn't free. What Romney and Ryan don't understand is that neither is opportunity. We have to invest in it.
    Julian Castro, DNC 4 Sept 2012

    by pixxer on Thu Nov 29, 2012 at 12:05:02 PM PST

    •  Fixed! Not sure what I was thinking either... (2+ / 0-)
      Recommended by:
      pixxer, confitesprit

      I love the idea of the long timeline.

      •  I'm not sure about the end of the snowball (1+ / 0-)
        Recommended by:
        pixxer

        I've seen a bunch of theories, but I don't know if there is any consensus. Hotter sun, shift in orbit, volcanoes blanketing the snow with ash that absorbed more light are also considered possible.

        •  Thanks. All interesting and (0+ / 0-)

          no doubt viable ideas overall. I'm not clear on the progression of the "faint young sun" at all. The whole "snowball Earth" idea is astonishing to me, but evidently we made it :)

          Thanks again for your article!

          For a really fun vantage point on this history - have you encountered Dawkins' The Ancestor's Tale?

          We all understand that freedom isn't free. What Romney and Ryan don't understand is that neither is opportunity. We have to invest in it.
          Julian Castro, DNC 4 Sept 2012

          by pixxer on Thu Nov 29, 2012 at 01:08:58 PM PST

          [ Parent ]

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