Don’t throw water on it. Don’t use a spice blender on aluminum foil trying to make aluminum powder.

I put up with that shenanigans in my room for one day before resorting to the “physical lockout” tactic: I leave one of them unplugged all the time.

Update: do NOT buy a high pressure sodium bulb with standard light bulb threads and screw it into a standard bulb socket. They require a ballast to work.

Anyone tried a high pressure sodium lamp? ($11) Wider range of wavelengths, but considering trying a filter or maybe a prism to separate. And metal halide bulbs ($25) have sharper wavelength spikes, but also have other colors, so filters might work better on that. Suggestions?

It took me an hour to figure out how to make a shortcut, but worth it to me.

I’m still here and many other physics and math Ts stuck around. I spent a large portion of the early days blocking, muting, and “not interested in”-ing stuff, and my feed is pretty close to before. I’m missing the people who left but they scattered to multiple other places.

#iteachphysics if you hear an airplane, and point at the direction that the sound from a plane is coming from, it comes from behind the plane. Without studying (much) airplane identification, can you calculate/estimate height, velocity, size, or other data based on this?

America’s Test Kitchen YouTube channel just (11 days) released a video about the uses of powdered acids in cooking.

And if you really wanna cook your noodle: if you do find the three phase diagram for water, zoom out and see the other (>3) phases.

It is a topic for AP Chem. I love this next fact, because it will either be obvious or mind blowing: you can tell this diagram is not water because the solid-liquid interface has a positive slope, not a negative one.

Mushrooms are super versatile in different applications. Give them the acid challenge: Citric acid, different types of vinegar, ascorbic acid, or any combo/choice and they have to use it in the food prep and explain why/how it works.

The walls are blast resistant, and an interior room would be a concern for a high O2 environment. The walls of the vessel are carbon steel (in most countries) and need to stay warm(ish) to avoid cracking.

Info per a cryo gas expert: the tanks are well enough insulated that sunlight won’t affect, and not worth the cost of building an overhang or finding the shady side of building. Also: those silver things are heat exchangers to turn the LOX into gas and work better in sunlight /1

Same here!