Somebody asked me why Abiogenesis happened only once.
My response was that it may very well have happened multiple times but that the Earth's atmosphere transitioned from 'reduced' to 'non-reduced' when fotosynthesis evolved and that this resulted in the extinction of all the other strains of life (the Great Oxygenation Event).
However, this can not account for it wholy because what about life forms that do chemosynthesis? How much have these life forms been examined? Are they known to be part of that same life strain (and simply well shielded from the non-reduced atmosphere and therefor unaffected? Or is the research pointing in another direction? A second abiogenssis? A remainder from the first? A return to the 'basics' comparable to the return of the whale to water?
Ball State University is investigating a complaint that one of its assistant professors in the department of physics and astronomy is preaching rather than teaching. Read more of the article here.
Engineers and doctors 3D printed this custom-made splint that currently holds open the airway of a six-week-old infant and will be gradually absorbed into the body over time. Image via University of Michigan For most of human history, any baby who suf...
Daniel Dennett: serious, but not solemn. Photograph: Bettina StraussDaniel Dennett, a cheerleader for Darwin and atheism, attracts fierce criticism for his views on free will. He talks about his new book and explains why philosophers have to walk a tig...