How To Make Paint From Pollution | World Wide Waste

It's always good to see somebody turning toxic waste into something useful and doing some good for the environment in the process, but it's pretty clear that unless they scale this up to massive size, they're never going to be making more than a drop in the acid mine drainage (AMD) coming out of even this one mine in southeastern Ohio.

I'm kind of tempted to buy their paints even though I don't paint. I guess I'd give it to one of my art teachers and let them use it with their students. I just want to help out the cause in a little way even. I guess I could donate, but I can't figure out how to do that from John Sabraw's webpage. He says you can donate to it, but I can't find the choice he says to make in the drop down.

You Spend More on Rust Than Gasoline (Probably)

Heya, Grady. Always good to see ya.

Today's video isn't really all that special. There isn't much revolutionary here, but it's the first in a series about rust and corrosion that Grady has announced and that I'm looking forward to because his garage demos are consistently outstanding. He does show us some bolts in oxygen-rich salt water with time lapse corrosion rolling along. 

I'm looking forward to what he has coming in later installments.

How To Make Skulls Using Old Milk Jugs And A Heat Gun

You can get a way cheaper heat gun from Harbor Freight if you need one.

This project is just a different application of our in-class demonstration of inflating a milk jug using that same heat gun, but here once the HDPE jug is softened, it gets molded around a somewhat-heat-resistant skull and cooled to hold that new shape

Sound like a fun idea - and very appropriate for the spooky season that we find ourselves in.

Launching molten iron with a shovel

There's no info posted with this video...none at all.

The original was posted to reddit (in a subreddit to which I'm not going to link because of the problematic title), and there wasn't any info there, either.

I do appreciate that the two gents (I'm assuming gents, though I could be wrong) are in full PPE...

...unlike the guys in this video.

Blacksmith Rates 9 Forging Scenes From Movies And TV | How Real Is It? | Insider

Mark Wahlberg apparently needs to step up his forging game.

Today's video has Neil Kamimura looking at forging and blacksmithing scenes from movies and commenting on their authenticity.

• Iron Man - RDJ is a heck of an actor, but it's weird that he's banging on cold steel when he's got a hot forge right behind him. And how does steel that's not hot enough to glow actually sizzle in the water?
• Rambo - At least the steel's hot here. Sly should use a heavier hammer and hit the center of the anvil. Not a believable scene.
• Game of Thrones - Not a good sign that the sword's handle comes off so easily. The container that's melting the sword would have to be hot enough to glow if it's making the sword glow. Surface casting is pretty but isn't how it's really done. They also seem to have broken the law of conservation of mass.
• Avengers: Infinity War - At least they used an actual mold not just surface casting. Kinda cool that the two pieces forge welded instantly...that's not s'right. 
• Infinite - Mark Wahlberg need to hit harder and shouldn't wear a glove on his hammer hand. His sword is all wavy and not done. "Swords do not cut pipe." 
• LoTR: Return of the King - Flux looks pretty when you smack it. Might as well start from scratch not try to repair the blade. And the elf actors don't know what they're doing.
• Conan the Barbarian - Still surface casting with all sorts of pretty flames for the appearance and bad quenching.
• A Knight's Tale - Hit it harder, girl. 
• Ragnarok - Get your metal hotter, gents...and improve your aim. 

Apparently the forging scenes in movies are pretty crappy.

Q1. How does a prestressed precast concrete bridge beam work?

Concrete is great in compression, very strong stuff.

Concrete isn't so good in tension, however, so using any concrete slab in such a way that it will experience bending load - as a cantilever, for example, or a flooring slab with a long span - requires something to address that weakness in tension.

The most common solution is simple rebar...but then there's the prestressed option.

In the above video - the first in a series of twelve Shay Murtagh videos exploring prestressed concrete beams in great depth - explains what prestressed concrete is and why it's strong than just reinforced concrete.

In case you aren't aware of Shay Murtagh, they seem to be a company with at least 100 employees - many but not all of whom can line dance.