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v. t. e. In finance, an exchange rate is the rate at which one currency will be exchanged for another currency. [1] Currencies are most commonly national currencies, but may be sub-national as in the case of Hong Kong or supra-national as in the case of the euro. [2]
Time. In condensed matter physics, a time crystal is a quantum system of particles whose lowest-energy state is one in which the particles are in repetitive motion. The system cannot lose energy to the environment and come to rest because it is already in its quantum ground state.
William Edward Crystal (born March 14, 1948) is an American comedian, actor, and filmmaker. Crystal is known as a standup comedian and for his film and stage roles. Crystal has received numerous accolades, including six Primetime Emmy Awards and a Tony Award as well as nominations for three Grammy Awards and three Golden Globe Awards.