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At the beginning of the 20th century Einstein changed the way we think about Time. Near the end of the 20th century scientists learned how to cool a gas of atoms to temperatures billions of times lower than anything else in the universe. Now, in the 21st century, Einstein's thinking, and ultracold atoms, are shaping one of the key scientific and technological wonders of contemporary life: atomic clocks, the best timekeepers ever made. Such super-accurate clocks are essential to industry, commerce, and sc...

Recently, ultracold atomic and molecular gases emerged as an ideal playground to study and emulate a variety of systems from condensed matter to nuclear physics. In many quantum phenomena, the interaction between particles plays a fundamental role, acting as a binding agent and determining the “social” structure of particle ensembles. Remarkably, in ultracold gases the interaction can be externally controlled almost at will. I will discuss some of our recent experiments based on the two types of inter- a...