Sound Transit operates LINK (what gp was talking about) and Sounder (not light rail, operates on BNSF tracks, coaches are made by Bombardier and seem to be in use by many commuter rail systems). Not sure what you're referring to.
That's LINK light rail, operated by Sound Transit. Here's an article about the (new) cars they use: https://www.soundtransit.org/blog/platform/new-link-light-ra... -- I get the impression all light rail cars in general are made to order per specifications, rather than off-the-shelf.
I don't think this is meant as a test to determine whether someone is an adult. I think this is meant as a guide to how to conduct yourself once you realize that you are an adult.
SETI uses the gap between the H line and the OH line (the "water hole"). The whole region of the spectrum is kind of quiet for reasons, and the H/OH area is (perhaps parochially) thought to be a natural place for other water-chemistry life forms to look.
Back when things really had A and B sides, it was moderately common for big artists to release a "Double A" in which both titles were heavily promoted, e.g. Nirvana's "All Apologies" and "Rape Me" are a double A, the Beatles "Penny Lane" and "Strawberry Fields Forever" likewise.
I think it's because it alters the moral context of the act that you're going to take anyway. If I pick up a piece of litter on my own initiative, that's an act of virtue. If I pick it up after a petty authority tells me to, that's an act of subservience. People get upset at the existence of PSAs because (in this view) they rob them of the ability to act virtuously. Which is not at all a small thing!
Yes, emotional maturity can help, and it also depends on perspective (whether I identify with the author of the PSA). But when the situation gets more complex than picking up litter, I think people forget that this dynamic exists and is important.
We have some experimental data on this, though, since jetliners and volcanoes both inject sulfur into the stratosphere. The global air traffic halt of 2001 and the aftereffects of eruptions have been heavily studied.
(It would be ironic if the world's response to fossil CO2 emission is to mandate extra high sulfur jet fuel, but nothing would surprise me)
I think there are two strands: petroleum companies have long been interested in any connection between deep biology and oil; and I think around that time people found microbes in a few sterile-seeming aquifers.
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