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By bathing a column of strontium atoms in the super-intense light of a laser, the researchers created a clock so accurate it wouldn’t gain or lose a second over the entire age of the universe. But today’s new clock, also from JILA, takes that to the next level — or, rather, dimension.Instead of a single column of atoms, the team demonstrated how to use a three-dimensional cube of strontium atoms to generate the clock’s super accurate ticks.
Scientists now have accurate methods (see below ) for dating fossils.erectus (including the Java and Peking hominids - the archetypal Missing Link) and H.sapiens (including Neanderthals and Cro-Magnon) (see the modern taxonomic classification of humans).is heritable) and arises through processes such as mutation and recombination. Natural selection, gene flow and random genetic drift (the random change in gene combinations with each generation) drive evolution, resulting in a change in gene frequencies within populations .