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
Tin Tin Daily News Tin Tin Daily News Tin Tin Daily News also known as Tin Tin Yat Pao was a newspaper in Hong Kong, published between 1960 and 2000. In later years it took a pro-Beijing editorial stand. It was founded by the Wai Kee-shun family, who made their fortune in pharmaceutical industry and was the first colour-printed newspaper in Hong Kong. The newspaper was published by Tin Tin Publication Development Limited and was printed by sister company Tin Tin Colour Printing Company Limited. However, the publishing rights was owned by Tin Tin Yat Pao (International) Limited, which was majority owned by bank.