1 Brands: Tums, Caltrate, and most other brands.  Absorption: Calcium carbonate is alkaline based. It requires extra stomach acid for better absorption, so it is best taken right after meals or with a glass of acidic juice such as orange juice.
Tempered glass is one of two kinds of safety glass regularly used in applications in which standard glass could pose a potential danger. Tempered glass is four to five times stronger than standard glass and does not break into sharp shards when it fails. Tempered glass is manufactured through a process of extreme heating and rapid cooling, making it harder than normal glass.
Scientists have created glass tougher than steel out of five elements, including the rare metal palladium. Dr Robert Ritchie, a material scientist at the U.S. Department of Energy, said: 'The result is that glass undergoes extensive plasticity in response to stress, allowing it to bend rather than crack.Weâre bucking the trend here and pushing the envelope of the damage tolerance thatâs accessible to a structural metal.'. Initial samples of the metallic glass were micro-alloys of palladium with phosphorous, silicon and germanium that yielded glass rods approximately 1mm in diameter.