Graphene smaller amplitude and higher frequency. This phenomenon, named "membrane effect", was predicted by Lifshitz in 1952. A prediction that was published in 2015 suggested a melting point of ≈4125 K. Recent and more sophisticated modelling has increased this temperature to at least 5000 K. At 6000 K (the sun's surface having an effective temperature of 5,777 K) graphene melts into an agglomeration of loosely coupled doubled bonded chains, before becoming a gas. The carbon–carbon bond length in graphene is about 0.142 nanometers. Graphene sheets stack to form graphite with an interplanar spacing of . Graphene is the strongest material ever
Early 2000s recession late 2000s. Early 2000s recession The early 2000s recession was a decline in economic activity which mainly occurred in developed countries. The recession affected the European Union during 2000 and 2001 and the United States in 2002 and 2003. The UK, Canada and Australia avoided the recession, while Russia, a nation that did not experience prosperity during the 1990s, in fact began to recover from said situation. Japan's 1990s recession continued. This recession was predicted by economists, because the boom of the 1990s (accompanied by both low inflation and low unemployment) slowed in some parts of East Asia during the