Ginger is a natural antiseptic that kills the fungi that cause dandruff. It inhibits the growth of yeast, stopping flakes, itchiness, and dandruff before they happen. (Source) It reduces inflammation of the scalp as well as treats scalp acne due to its antiseptic properties.
Glass substrate is a sheet glass which makes flat panel displays (FPD), such as liquid crystal televisions (LCD), plasma televisions (PDP), and laptops displays. The ingredients differ from the sheet glass used for windowpanes. Ingredients also differ between liquid crystal and plasma displays.
Sand is not always the best substrate to grow plants in, but it is easier then gravel with certain plants. Just make sure they are weighed down enough (fine gravel may not work) and the roots of that particular plant are not delicate.