This document discusses the boron family of elements, which includes boron, aluminum, gallium, indium, and thallium. Boron is a nonmetal that occurs naturally and is used in supplements, while aluminum is a lightweight, soft metal used widely in products like cans and foils. Gallium is a soft, silvery metal used in electronics. Indium is used to dope semiconductors and in low-melting alloys. Thallium was discovered in 1861 and is a heavy, soft poison sometimes used by murderers.