Are Electric Cars Really More Environmentally Friendly?

I'd heard that at one point the average electric car (or hybrid) is worse for the environment to produce than even a Hummer because of the energy that goes into the production of the battery. The moment the two vehicles start driving, the electric vehicle starts catching up with its Hummer competitor.

The video today doesn't necessarily get into that. It looks at the efficiency of electricity produced by power plants and compares that to how efficient a gas-powered car would need to be in order to be more efficient than an average EV in various states of the US.

I did not know that - as of this video being produced in 2018 - Colorado was the dirtiest power-generating state and that Alaska was the cleanest.

Glass is a recycling nightmare. Here's one city's solution.

I assume the gloves are there so nobody gets cut by accident.

I would have thought that glass would be the absolute easiest material to recycle. It's effectively sand, after all. It could go into coastline; it could be remelted into new glass; it could go anywhere that sand can go.

I wouldn't have thought about the problems of weight and shipping of the recycled glass to its final, useful location.

Here's to hoping we can get all of this stuff worked out, because I'm trying to use more glass and less man-made polymers at any opportunity I get.

Metals in glass are AWESOME!

So many pretty colors of glass!

I have to hunt down some of those metal oxides to add to my glass in matsci class.

Just look at the possibilities...

source - from YouTube video above

Oh, and the video talks about how some metal oxides (erbium and holmium, in particular) change color in different light sources, but that doesn't diminish how pretty they all are.

source - from YouTube video above

I may make a project out of producing that rainbow up there for myself.

Anybody want to pitch in to share in the purchase of the various oxides? I know I won't be able to buy less than like a quarter pound each, and I'll only need like twenty grams 

The Ridiculous Engineering of Jet Engines

Jet engines are miracles.

The more I learn about them, the more amazed I continue to be by them. 

I've heard a number of times that the hot gasses passing by the turbine blades is hotter than the melting temperature of those blades.

It simple enough to say that the blades have ceramic coatings (thermal barrier coatings) on those blades and internal cooling channels that together keep the blades cool enough not to melt (or to creep too much outward toward the turbine's housing) at that phenomenal high temperatures.

...and then we get the bubble raft demonstration - which is just my absolute favorite.

And I just found out that the older video I had posted explaining the pigtail's function in creating single crystal turbine blades has disappeared from YouTube. I'm suddenly very sad about that.

How The World's Most Expensive Color Is Made

Good lord that's a labor-intensive process.

I understand that the quality of the final product is important and noticeable by really discerning artists and art lovers, but I'm amazed that anybody still uses this method to produce ultramarine blue from lapis lazuli. I'm kind of glad to know that he uses a different - supposedly secret, faster, and higher-yielding than the Cennini method.

I'll warn you that the later half of the video is mostly about the politics and economics of the mining in Taliban-controlled Afghanistan. It's interesting, but it's not so much about the material production but more about material sourcing.

Is spider web really stronger than steel?

I was not expecting an excellent explanation of stress-strain curves (2:30), toughness (6:00), environmental costs of polymer production (7:00), amorphous vs (nano)crystalline regions (6:45), hydrophobicity (and hydrophilicity) (12:45), and CRISPR/Cas9 technology (20:30), but that's what you get in today's Veritasium video.

As an aside, I want to rant and rave about the investment in Veritasium by Electrify, but the quality of the videos, the topics being covered, and the volume of output have stayed at least as high and might in fact have improved.

Inside the Race to Save the Clay Behind "Wallace & Gromit" | WSJ

If you rely on one source for a material, you run the risk of that one source either holding you hostage or that source simply drying up.

Note, this is just about the clay source for Wallace & Gromit (or rather for Aardman animators) - not about anything to do with material needs in the production of rare earth magnets and electric motors.