Perhaps the appeal of Zen is that it stepped away from Mahayana's "God and entities", and went a bit back towards the Buddhist psychology-like/self improvement grassroots?

This was the first generation of commercially successful radios.

It uses a crystal detector as its diode, which is a crucial element of the radio, thus its name.

They were superseded by transistor radios, which were much more reliable, portable and could amplify the signal received.

Bought circa 2017.

This notation is not so common in basic mathematics, but it is so incredibly convenient, especially with Einstein notation as shown at Section "Einstein notation for partial derivatives":

This notation is similar to partial label partial derivative notation, but it uses indices instead of labels such as $x$, $y$, etc.

This is generally good, especially compared to how crappy Evince, the default Ubuntu one, has been around 2014-2020.

Ezra Brown does not appear to be a widely recognized term or concept as of my last update. However, you might be referring to Ezra Miller, an actor known for roles in films like "Fantastic Beasts" and "The Perks of Being a Wallflower.

Pamela G. Coxson is not widely recognized in public domains, so there may be multiple individuals with that name or it may refer to a private individual. If you could provide more context or specify the field in which you are interested (such as academia, literature, etc.

David May is a British computer scientist known for his contributions to computer architecture, programming languages, and software engineering. He has worked on various aspects of computer systems, including hardware design and the development of languages that enable more efficient programming and system interaction. One of his notable contributions is in the area of concurrent programming, particularly with the development of the Occam programming language, which was designed for programming the Transputer, a pioneering piece of hardware in parallel computing.