Terrariums have taken the gardening world by storm over the past decade, transforming from obscure Victorian curiosity to homeware-store staple, but in almost all of the advice on how to create such miniature gardens in sealed glass containers – online, in books, or in-person classes – you’ll find a tip to adding activated charcoal to the potting soil.
This substance is easily found as a premium food supplement, sold at fairly exorbitant prices, and is often touted as essential for building a functional body…
Source: www.newscientist.com
