[evan_au]

What would the kinetic energy of a bullet falling from 2Km be?

I know someone who grew up in Iraq; on hot nights they often slept on the roof.
- Her sister woke up one night and found a bad bruise on her leg.
- It didn't improve over the next few days, so they took her to the doctor, and he discovered a bullet embedded in her leg.

I shot an arrow into the air, it fell to Earth I knew not where.

I ran out of regular 60/40 solder and I needed to order a fresh supply..."ONLY FOR PROFESSIONAL USERS"

For many years in my industry, tenders for electronic products always required "RoHS compliance": EU Restriction of Hazardous Substances
- This bans a number of substances in electronic equipment, including lead.
- So your 60/40 lead/tin solder is now 40% illegal in the EU.
https://en.wikipedia.org/wiki/RoHS#Details

Other solder alternatives include alloys of Tin, Gold & Copper, but they have a higher melting point, and perhaps more toxic flux, so avoid breathing the fumes.
https://en.wikipedia.org/wiki/Solder#Lead-free

[evan_au]

Another quote related to firing bullets into the air, from a satirical song by Tom Lehrer about Werner Von Braun...

Don't say that he's hypocritical,
Say rather that he's apolitical.
"Once the rockets are up, who cares where they come down?
That's not my department, " says Werner von Braun.

https://tomlehrersongs.com/wp-content/uploads/2018/12/wernher-von-braun.pdf