Ciro Santilli @cirosantilli  40

We intersect 2013 DNS Census virtual host cleanup with 2013 DNS census MX records and that leaves 460k hits. We did lose a third on the the MX records as of 260 hits since secureserver.net is only used in 1/3 of sites, but we also concentrate 9x, so it may be worth it.

Then we Wayback Machine CDX scanning. it takes about 5 days, but it is manageale.

We did a full Wayback Machine CDX scanning for JAR, SWF and cgi-bin in those, but only found a single new hit:

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They were superseded by transistor radios, which were much more reliable, portable and could amplify the signal received.

The first diodes. These were apparently incredibly unreliable, especially for portable radios, as you had to randomly search for the best contact point you could find in a random polycrystalline material!!

And also quality was highly dependant on where the material was sourced from as that affected the impurities present in the material. Later this was understood to be an issue of doping.

It was so unreliable that vacuum tube diodes overtook them in many applications, even though crystal detectors are actually semiconductor diodes, which eventually won over!

For a long time, before artificial semiconductors kicked in, people just didn't know the underlying physical working principle of these detectors. What I cannot create, I do not understand basically.

This one took a while! Major developments were from the 70s! Perhaps it took the Internet revolution to make its importance clear.

Cool that there is actually a page for a change: www.ox.ac.uk/students/academic/exams/timetables e.g. working in 2024: web.archive.org/web/20240305013807/https://www.ox.ac.uk/students/academic/exams/timetables

And translating from their arcane vocabulary: