You should save those silica gel packets that come with your purchases. Here's why | ZDNET
Diboron(4) Compounds: From Structural Curiosity to Synthetic Workhorse | Chemical Reviews
Amazon.com: Pumice Stone for Toilet Cleaning Bowl Stick, Remove Hard Water Rings Stains on Toilets Bowls, Bathtubs, Pool Shower Tiles, 2 Count : Health & Household