
In the long history of evolution it has not been necessary for man to understand multi-loop nonlinear feedback systems until very recent historical times. Evolutionary processes have not given us the mental skill needed to properly interpret the dynamic behavior of the systems of which we have now become a part. J. W. Forrester, 1971
Saturday, May 17, 2008
Monday, April 21, 2008
Socially Responsible Investing

After the Exxon Valdez
Socially responsible investing (SRI) in the United States is now growing at a much faster pace than the broader universe of all investment assets under professional management (Report on Socially Responsible Investing Trends in the United States, SIF). From 2005 to 2007, SRI assets increased more than 18 percent, while all investment assets under management edged up by less than 3 percent.
SRI is a broad-based approach to investing that now encompasses an estimated $2.3 trillion out of $24 trillion in the U.S. investment marketplace. SRI recognizes that corporate responsibility and societal concerns are valid parts of investment decisions. You may also hear SRI-like approaches to investing referred to as mission investing, responsible investing, double or triple bottom line investing, ethical investing, sustainable investing, or green investing.
For more information, go to the Social Investment Forum
Sunday, April 20, 2008
Wednesday, April 16, 2008
Milky Way Black Hole

In the middle of our own Milky Way Galaxy, lies a black hole. Two hundred billion stars revolve around it, drawn by its inexorable power -- a power driven by a mass four million times that of the sun. No one has ever seen a black hole, for no light can escape their boundless depths, but they do emit X-rays. The photo above shows X-rays made visible in an image of the Milky Way’s black hole, with matter swirling towards it. Have you ever wondered what's on the other side of a black hole?
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For more on the story, see the April 2008 issue of Smithsonian
Thursday, April 10, 2008
Condor

We watched this giant bird
soar so far above us
Surely its wings
would shade us from the sun
and beating the air
would cause the birch to sway and bend
the leaves to flow along the dry river bed
and soaring into the heavens
would bring us rain
So great a creature
we made it a god
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The California condor is an impressive and ugly bird -- with a bald, leathery head, red eyes and a big, razor-sharp beak. It's the largest living thing flying over North America -- with a nearly 10-foot wingspan. Listen to a special report and read about it on NPR.
Sunday, April 6, 2008
Friday, April 4, 2008
September 11, 2001 Re-imagined Redux
Back in May, President Trump abruptly dismissed "dozens national security advisors from US National Security Council (NSC). NPR reporte...

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The Pericardium I was trying to give my heart to my cardiologist, let’s call him Dr. Sing. “Why would I want your heart?” he asked ...
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I am not an MD. What you read here is based on my own personal experience with prostate cancer, and how I went about deciding what to do ab...
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The Colossal Squid is the biggest invertebrate on the planet. In February 2007 a female colossal squid was caught accidentally by the boat S...