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Evolutionary Change Is Just That, Change, and Change Often Is a Mixed Bag and More Complex Than Anticipated

There is an unfortunate tendency to conceive of evolutionary change as causing an adaption to a selection factor that marks an improvement in addressing the environment in which the selection factor exists. Were it only so simple. Change may be an improvement, but sometimes it brings unfortunate baggage...

Unexpectedly, Prions Can Move Between Species and Target Organs Other Than the Brain

A recent post noted that viruses from bush meat can jump from one species to the next, and that as such bush meat poses a major health threat. The mobility of prions has also been underestimated. (For a general description of prions, see Prion .) Researchers have shown that engineered mice can be infected...