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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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