नॉरेथिंड्रोन (Norethindrone), जिसका व्यापक रूप से जनन-नियंत्रण (antifertility) औषधि के रूप में उपयोग किया जाता है, एक है:

To prevent the oxidation and rancidity of potato chips during storage, manufacturers flush the sealed bags with which gas?

Early matches ignited when struck on a rough surface primarily due to the friction of which substance?