Chainsaw - this is completely off-topic, but you might be a bit careful about ingesting that poison ivy. I was always "immune" to its effects when exposed as a youth, but have carefully avoided touching it in recent years, after two friends have developed extreme sensitivities to semi-irritating materials.
I spent some years at the Armed Forces Institute of Pathology (AFIP), and we had a pathologist who suddenly developed an extreme sensitivity to formalin, after a lifetime of obviously very heavy exposure. Since it clearly made it difficult for him to work in his field, we made him curator of the Armed Forces Medical Museum instead.
The second example was a friend who'd been an antique dealer and refinisher for 20-some years, spending a goodly amount of time slopping around in solvents of all kinds. By the time I knew him he couldn't get near most any strong chemical or solvent. I was brushing gallons of Cuprinol on some floor joists, not even using gloves, but just walking in that basement broke his exposed skin out in a hives-like rash within minutes, apparently just from the residual fumes.
I don't know enough chemistry or biology to even guess what process or processes were at work in either case, but it persuaded me that limiting my deliberate exposure to poison ivy might keep me "immune" longer.
Without knowing for sure how these processes work, and how quickly they might evolve, I'd personally recommend talking to a good allergist to see if I was likely to get a fatal surprise at some point, or whether any change in sensitivity was likely to give me some warning early on.
I enjoyed your website and may try a bit of stump-carving on some pines I need to take down. But every time I crank up my trusty Stihl 034, I have not the slightest inclination to carve any initials in my toenails. Call me chicken ....
