"In the summer of 1842 I was strong than I had been for some time, and took a little tour by myself in North Wales, for the sake of observing the effects of the old glaciers which formerly filled all the larger valleys... This excursion interested me greatly, and it was the last time I was ever strong enough to climb mountains or to take long walks such as are necessary for geological work." " Charles Darwin, Autobiography
Only 33, Darwin does his last hike then he hangs up his boots. Despite my own heath issues, I'm still hiking strong (though winded too easily). But he obviously adopts the new glacial theory and this trip resulted in a paper. Nice.
"In the summer of 1842 I was strong than I had been for some time, and took a little tour by myself in North Wales, for the sake of observing the effects of the old glaciers which formerly filled all the larger valleys... This excursion interested me greatly, and it was the last time I was ever strong enough to climb mountains or to take long walks such as are necessary for geological work." " Charles Darwin, Autobiography
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