Some might not agree but evolution comes to mind. Mosquitoes show up with random mutations in their gene makeup that by a long-shot chance makes them more tolerant of DEET (as a specific example). It's actually somewhat of an accident. Those bugs could possibly be (not necessarily though) have an advantage to live to maturity and breed, hence the mutation eventually works its way into the gene pool over generations and then more and more bugs are tolerant. And on and on it goes. Eventually when things get bad enough, a new chemical will show up in the marketplace which starts the whole process over again.
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Today's Featured Article - Talk of the Town: Best Tractor? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew quite a bit of response. We see the question of "Which tractor is best for me?" asked quite often. We thought you might find the responses interesting. As always, the names of the people participating in the discussion have been left out - we did not request their permission to reprint their names in this article. However you can find this discussion in it's entirety in the Tractor Talk archives.
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