Define News

NO

YES

NO

YES

YES

The cesium 133 F=3 <-> F=4 hyperfine microwave transition (no change)

Any system based on weighted averages of uncertainty or timekeeping contributions

The strontium 87 1S0 <-> 3P0 optical transition

The ytterbium 171 1S0 <-> 3P0 optical transition

Any other optical transition in ions

Any other optical transition in neutral atoms

NO

YES

YES

NO

Between $1t and $5t

Between $500b and $1t

>$10tn

Between $5t and $10t

Between $100b and $500b

NO