re: #54 karmic_inquisitor

On another note, I would expect to see a similar article on the rapid change in Eucalyptus varieties here (introduced from Australia by railroads trying to find a fast growing, drought tolerant tree to use for railroad ties - but wood twists as it dries rendering it useless) as they fight off the longhorned beetle. Some new trees are showing resistance to the beetle that was introduced to California in 1985.

[Link: wwwlibrary.csustan.edu…]

Evolution is powerful.

Most countries now use cement railroad ties, which will outlast anything produced by nature. I think this evolutionary direction influenced by people (if that is what you meant) is a dead end. Go Beatles anyway!!