cesium-137

CuriousMarc powers up a vintage HP 5061A cesium beam clock and explains both the quantum principle and the HP implementation in detail. It is part of a longer atomic clock series.

An episode of the Well There's Your Problem podcast on the 1987 Goiania radiological accident in Brazil, based largely on the IAEA report. It goes through the event day by day.

The Explosions&Fire channel taste-tests the chloride salts of the alkali metals (lithium through cesium), plus some alkaline earth metals and ammonium. The presenter describes the flavors, and the results are more pleasant than expected.