sábado, 30 de noviembre de 2013

The man who bottled evolution

Evolution is a slow process that cannot be seen in real time. So evidences of evolution are always searched backward in time, using the fossil record, genetics or biochemistry of living things today, but it cannot be studied forward (we never know how species are going to change).

Plates with bacteria culture
In 1988, at the Michigan State University, an experiment started with bacteria. Richard Lenski and his research group began to grow 12 populations of Escherichia coli and by reproducing and caring them day and night they have completed over 58.000 generations(equivalent to 1 million years in humans).
The conclusion in this experiment, which has been operating for over 25 years, is evolution never stops, even when the conditions of life do not change.

I leave several links to the news

Experiment data.  Science

References: Fogonazos

martes, 26 de noviembre de 2013

Darwin on the evolution trail

This video summarizes Darwin's life, from his early youth as a collector of insects through the 5 years trip on the HMS Beagle until he published his book "On the origin of species by means of Natural Selection". We can see how he was shaping and maturing his shocking and revolutionary idea of evolution and the difficulties he encountered .... even in his own wife ("I don't like your ideas, Charles!")

Reference: Evolution of life