For the second of those evenings this week, I shall now

distract from the state of my knees by bringing up the data for the evening.

I'll take "People who need to be clubbed" for thousand, Alex

On multiple grounds.
That’s in part because it’s highly controversial. Little is known about the real-world effect of such deliberate interventions at large scales, but they could have dangerous side effects. The impacts could also be worse in some regions than others, which could provoke geopolitical conflicts.

Some researchers who have long studied the technology are deeply troubled that the company, Make Sunsets, appears to have moved forward with launches from a site in Mexico without any public engagement or scientific scrutiny. It’s already attempting to sell “cooling credits” for future balloon flights that could carry larger payloads.

Several researchers MIT Technology Review spoke with condemned the effort to commercialize geoengineering at this early stage. Some potential investors and customers who have reviewed the company’s proposals say that it’s not a serious scientific effort or a credible business but more of an attention grab designed to stir up controversy in the field.
Not to mention a way to fleece idiots of their money. 'Cooling credits' my ass.

Shuchi Talati, a scholar in residence at American University who is forming a nonprofit focused on governance and justice in solar geoengineering, says Make Sunset’s actions could set back the scientific field, reducing funding, dampening government support for trusted research, and accelerating calls to restrict studies.
No SHIT?

Reminds me of the idiots gluing themselves to streets and museum walls times 100.  "It's desperate, we HAVE to do this!"  

It being the first of those two evenings,

Enjoy

When an email starts off "Will you join me friend?

I'm sure I can count on you(confidential message for...), the chances of my opening it are zero.

And I really wish you'd stop sending this crap, because the only thing you can count on is you're annoying me.

Go to PT

Go to the store.

Then to the post office.

Then sit a while.  To enjoy the throbbing in your knee.  Crap, it's nasty today.

A link to all the Twitter files(so far),

with summaries.

Back when I was smithing, I never used any of the highly-alloyed tool steels (with an addition on steels)

such as D2, and 154CM, or a number of others.  Being as I am, I wanted to do the heat-treat by myself, and the process on some of them is downright intricate: very specific temperatures, some giving the best results when brought up to heat in a certain profile(First to A temp for x time, then to the next, etc.)  Some are air-hardening, as in they come out of the fire/furnace you just let them cool in the air.  But the tempering... that's touchy.  A lot of blademakers who worked with them sent the blades to a professional for heat-treat, with notes such as "This blade should be RC58 when done."

A lot of people use an electric furnace both for both hardening and tempering since you can very precisely control the temperature, and thanks to electronics set a specific heating profile.  They were fairly damned spendy(back then and now) and I didn't do this enough to make that affordable.  So I used coal, prepped the fire carefully, and heated the quench oil so it would flow well and give the most even quench(and that is one trick I wish I'd learned a lot earlier).

Favorite steels I used... depended on the piece.  Big chopping blades, and swords, 5160 spring steel.  Smaller blades I wanted to hold an edge really well, generally O1.  Once I'd had a chance to try some, I liked harrow teeth; a blade forged of those held an edge really well.  Especially when I accidentally found out something: I did the tempering in the oven, and usually did three heats, letting it cool completely between the first two.  One night I forgot a harrow tooth blade on its third heat in the oven over night.  Lord, that thing held an edge!  I did that as part of the process from then on.

Added:

I forgot one: 52100B, a high-grade bearing steel, used in both bearings and the races the ran in.  I will tell you, forging a large bearing out to a bar would wear you out; just remembering it makes me wish I'd had  or had access to a power hammer.  But handled right, made damn good blades.

Things other than knives, anything that would work.  I made a LOT of flint & steel strikers and screwdrivers, things like that, from overhead garage door spring, and I could often find a section of a broken one and get it free.  Unwinding it was a pain, but worth it.  Mild steel for candleholders, eating sets, fireplace/campfire tools, belt buckles, and other things.

I also discovered stone drills, the old kind.  Which I cannot find a picture of.  Generally either round or, all the ones I found, hexagonal in shape and anywhere from a foot to several feet long for some big ones, with four flutes and a point formed at a shallow angle.  You held them in place on the stone and hammered to drive them in.  I've found them anywhere from about 3/16" thick to 1/2".  You could forge them to shape and then grind to final size, use an oil quench to harden and the go by color(with some experimentation) for hardening, and they made damn good chisels and punches.

Yes, the wondering about tempering on Forged in Fire reminded me of some things.  I miss it, though it may be partly why some of my joints are so worn.

Very interesting piece on when the big rock fell at Yucatan

He seems to have found a site that dates to the impact itself and very shortly after.

But wait! A bit of clearing as I delay the discomfort