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ultraviolet Scott Sexton
How to Make Herbal Sunscreen
Scott Se..
date_range June 26, 2021
Here's how to make herbal sunscreen, plus details on "edible sunscreens," herbal after-sun care, and common-sense solutions for sun safety.
Mad Scientist Works For Greenhouse Heating Independence Down To -25F
Writing ..
date_range March 22, 2018
Can you build a solar-powered greenhouse that keeps temperatures above freezing when outside temperatures drop to -25°F? That's what retired engineer