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The Krypton Problem One of the many advantages of using xenon as a dark matter target is that xenon has no naturally occurring long-lived radioactive isotopes.

However, when xenon is distilled from air, about 1 krypton atom per billion xenon atoms is also gathered.

Or do we simply pick the one in the brightest yellow bottle?

In a fascinating talk at TEDx Stanford, “Sometimes it’s good to give up the driver’s seat,” marketing professor Baba Shiv reveals that discomfort over making choices extends into medical decisions.

A very small fraction of these krypton atoms, only one in one hundred billion, are the radioactive isotope 85-Kr.