Natural Science Forum / Biology / Evolution / April 2009

New Nucleotide In DNA Could Revolutionize Epigenetics
ScienceDaily (Apr. 17, 2009) - Anyone who studied a little genetics in high
school has heard of adenine, thymine, guanine and cytosine - the A, T, G and
C that make up the DNA code. But those are not the whole story. The rise of

I'm teaching a philosophy class at a high school, and have started a
multi-stage debate over human nature.  The class has divided itself
into two groups ("nature" vs. "nurture", of course!), and is aping the
arguments made in historical texts to help advance their own theses.

Did a nickel famine trigger the 'Great Oxidation Event'?
April 8th, 2009 in Space & Earth / Earth Sciences
(PhysOrg.com) -- The Earth's original atmosphere held very little oxygen.
This began to change around 2.4 billion years ago when oxygen levels

[This is an edited resend. The original was sent on 31/3/09 but appears
not to have been posted to the group]
Jim requested that I provide a series of posts as a tutorial
specifically referring to my use of set theory within evolutionary