A new kind of refrigerator for cooling below 0.1 °K holds great promise for cryogenics. Over the past year several groups have built He3‐dilution refrigerators that can cool samples continuously below 0.2°. Although adiabatic‐demagnetization methods have traditionally been used to cool below 0.3°, the new refrigerator is much simpler to use. At the April American Physical Society meeting John Wheatley (formerly of the University of Illinois and now at the University of California, San Diego) reported that his continuously operating He3‐dilution refrigerator had reached 0.020° and his single‐cycle device had reached 0.0044°.

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