The images you have to have in mind are:

Yes, Sheldon he has separate American and British English versions of pages!!!

For example, Kross bicycle (2017) had a Schwalbe tyre with markings:

42-622 (28 x 1.60, 700x40C)

When inflated, the tires were about 3.5cm wide as measured with a ruler.

And the Mavic A319 rim had markings:

622x19C

In this:

ISO (Etrto): 42-622. So:
- 42 is the inner rim width. The actual inflated tire is going to be even wider.
- 622 is the bead seat diameter. The actual inflated tire is going to be even wider.
imperial: 28 x 1.60
French: 700x40C:
- meaning of the "C" asked at: bicycles.stackexchange.com/questions/16190/what-does-the-c-in-bicycle-tire-size-mean
  - www.sheldonbrown.com/tire-sizing.html#french says A is larger than B which is larger than C, and C means 622 mm

Shimano product lines

Overview of Shimano brands 2018: www.evanscycles.com/coffeestop/advice/the-complete-guide-to-shimanos-mountain-bike-groupsets-and-their-hierarchy

Shimano Altus RD-M310: almost cheapest MTB
Shimano Acera RD-M360: second cheapest MTB
Shimano Alivio RD-M410: third cheapest MTB
Shimano Claris: entry 8-speed road bike www.youtube.com/watch?v=6dFQDDg6Wt0
Shimano Sora: 9-speed road bike bike.shimano.com/en-EU/product/component/sora-r3000.html
Shimano Tiagra: 10-speed road bike bike.shimano.com/en-EU/product/component/tiagra-4700.html
Shimano Deore: non-shitty MTB, in increasing performance: M610, M6000, M7000, ...)
Shimano Tourney; commuter, likely the shittiest of all lines: bike.shimano.com/en-EU/product/component/tourney.html

SpaceX

Video 1.

What Elon Musk's 42,000 Satellites Could Do To Earth by Tech Insider (2020)

. Source. Good primer. The main difference from older systems is that they fly closer to Earth, and are not geostationary. As a result, you have better latency. But you also need a bunc of them to have continuous coverage of an area.