Tin foil hat radio with a metal bucket. The AM radio is completely inside a metal enclosure. This leads to a noticeable reduction in signal strength received by the AM radio. The efficiency of a metal enclosure in blocking electromagnetic radiation depends on the thickness of the foil, as dictated by the "skin depth" of the conductor for a particular wave frequency range of the radiation. For half-millimetre-thick aluminum foil, radiation above about 20 kHz (i.e., including both AM and FM bands) would be partially blocked, although aluminum foil is not sold in this thickness, so numerous layers of foil would be required
ChapStick popular lipstick-style tube for their lip balm products. In Iceland and in the United Kingdom, the product's main competitor is Lypsyl, made by Novartis Consumer Health and distributed in similar packaging to ChapStick. In the early 1880s, Dr. Charles Browne Fleet, a physician and pharmacological thinker from Lynchburg, Virginia, invented ChapStick as a lip balm. The handmade product, which resembled a wickless candle wrapped in tin foil, was sold locally, and did not have much success. In 1912, John Morton, also a Lynchburg resident, bought the rights to the product for five dollars. In their family kitchen, Mrs. Morton melted