Ciro Santilli @cirosantilli  40

Space between the inner and bacterial outer membrane in Gram-negative bacteria

Uses the frequency of the hyperfine structure of caesium-133 ground state, i.e spin up vs spin down of its valence electron $6s^1$, to define the second.

International System of Units definition of the second since 1967, because this is what atomic clocks use.

TODO why does this have more energy than the hyperfine split of the hydrogen line given that it is further from the nucleus?

Why caesium hyperfine structure is used:

Chordate is a sad clade.

You read the name and think: hmm, neural cords!

But then you see that his is one of its members:

Yup. That's your cousin. And it's a much closer cousin than something like arthropods, which at least have heads eyes and legs like you.

Convergent evolution is crazy!

A single hole that is used for shit, pee and fucking. Amazing.

See: angular momentum operator.

They have been masters of second sourcing things for a long time! One can ony imagine the complexity of the Intel cross licensing deals.

Like Google custom silicon, Amazon server operations are so large that with the slowdown of Moore's law, it started being worth it for them to develop custom in-house silicon to serve as a competitive advantage, not to be sold for external companies. Can you imagine the scale required to justify silicon development investment that is not sold externally!