I clicked a Look Inside and must say the content is slightly more coherent than I thought it would be. Did you make the list of topics yourself? Is anybody buying these books? Is there any pushback from Amazon when…
Handheld UV water purifiers are already common. A lot of backpackers use them. I'm not sure how they work. Presumably they're not using LEDs.
I clicked a Look Inside and must say the content is slightly more coherent than I thought it would be. Did you make the list of topics yourself? Is anybody buying these books? Is there any pushback from Amazon when…
Handheld UV water purifiers are already common. A lot of backpackers use them. I'm not sure how they work. Presumably they're not using LEDs.