Poxysox on Instagram: "Episode 34: Selenium Important nutrient, powerful toxin, red powder, shiny metallic crystals, Selenium is a chemical of many opposing roles! Fun fact I learned reading up for this video: Apparently in 2009 before a prestigious Polo competition, all 21 horses accidentally had their selenium supplements boosted by a lot by accident, and all the horses succumbed selenium poisoning right before the game! Very Niche tragedy #science #scienceart #sciencefacts #chemistry #periodi