Mainly because it's a complex multi-step plan with so many potential failure points, which would already be impressive if executed on Earth but even moreso being executed on a distant planet where the conditions are different enough that it can't be fully tested in advance, and yet despite that the whole scheme worked flawlessly.
But if I had to name a specific part, I'd pick the control system. The skycrane is dangling a heavy rover from a pendulum controlled by rockets. It's unstable in every axis and has tight performance requirements to let the rover down softly and not kick up dust. Just very impressive.
My understanding was the 20m tether length was designed to avoid dust. More interesting to me were the choice of nylon vs. other polymers, the equal-release multi-line spool design and the choice of cutting the lines on the rover (permanent mission-long mass penalty) vs. skycrane (which is discarded).
Record new issues is one of the classic signs of a bubble [...] The new big three IPOs will dwarf the entire amount raised during the [1999-2000] tech bubble even when accounting for inflation.
Key quote: "permanent juvenility has evolved multiple
times", nominally making neotony a more highly evolved and expressly desirable characteristic as voted by life itself.
Now we can say certainly, at least in ancient Australia (if you're a plant): growing up is for losers!
I know some people who have kept their kids from having phones into high school.
In Australia this is normal. The distribution of phones increases slowly during high school, not before. Kids don't really use phones anyway, they use some combination of online games and messaging apps so they can do it from a computer or tablet without a phone.
My kids used the home phone for many years before they got their own cell phones. They would call their friends and grandparents. (The grandparents loved it)
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