Linoleum flooring is cool, actually

"If there were a floor covering Olympics, marble would probably get gold. Hardwood would get silver. Bronze would maybe go to tile — and linoleum wouldn’t even make the trials. Arguably the most maligned flooring there is, these days linoleum is considered (at best) something you rip out to get to the real floor. But it wasn’t always that way."

That's the description from the YouTube description as Vox wrote and is shown below the video. I'm not sure I can do much better than that.

Linoleum sucks. That's the general, modern impression of linoleum, but there's a lot more to the fascinating history and construction of the composite flooring known colloquially as linoleum.

There's really nothing wrong with linoleum, but it's just way out of fashion. It does require some waxing, but according to this video, it's way more environmentally friendly than vinyl - which I have throughout my entire home, natch.

Oh, that shot at 0:09 makes me think that the red, gray, and white flooring at Princeton High School is linoleum.

And the YouTube description includes links to learn more about the history and modern revival of linoleum.

Steel Metallurgy - Principles of Metallurgy

Again with the mAtallurgy Data channel...

Maybe they're trying to combine material and metallurgy into matallurgy?

Whatever portmanteau they're aiming for, their videos are excellent for understanding metals. This one goes over how different metallic ingredients affect the properties of alloy steels, the carbon-iron phase diagram, CTT and TTT graphs (something I haven't seen before, admittedly), hardenability, and ways to strengthen steel.

It's not necessarily written for my students' levels - most of them, anyway - but it's good background understanding for me to have.

Properties and Grain Structure

Properties and Grain Structure: BBC 1973 Engineering Craft Studies

Yup, 1973...that means not only is the narration done with an English accent, it's also paced for a 1973 world meaning I ran the video at 1.5 speed to bring it up to a modern pacing.

The video shows the etching process for various metals then does it again after cold rolling the aluminum sample, then discussing how the material's properties (ductility, hardness, toughness) change.

The video then repeats things for heat treating after cold working the aluminium (sp?)...then various carbon steels being annealed, quenched, and tempered.

I absolutely love the hand-cranked tensile tester that we see at around 8:10 in the video.

It's a great video for showing the properties and crystal structures of aluminum (sp?) and steel and how the crystal structures coordinate to that.

Understanding Material Strength, Ductility, and Toughness

Strength vs toughness is such a subtle concept for my students to understand.

That isn't really a tough (sorry) thing to reason out. The two words are used somewhat interchangeably in the non-material science world. 

This video does a great job animating and showing the differences between those words and using the stress strain curve to do so.