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I think you mix the two concepts of "the singularity is not physical" (which is true, as it is only a mathematical construct) with "black holes are not physical". We use different mathematical constructs to approximate physics effects. Using the notion of a singularity works if you are beyond the event horizon, but if you are close this would be a different and more complicated affair. Nevertheless, a black hole is real, wether or not we can fully describe it in every regime of space-time.

Do you want to have your mind blown? Because: actually THERE IS sound in space - really, really, REALLY quiet. Because - deep space is not really a perfect vacuum - there is about 1 atom of hydrogen per cubic centimetre. So, explosions such as a supernova DO create a sound wave - they are very quiet and very slow moving, but they definitely exist.

No, I agree salt is a better abrasive. But theyvstated that sugar wouldn't wash away as easily in water. When sugar is soluble in water, just like salt is. So im curious as to why the think it wouldn't wash away as easily.

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This may be a silly question, but why infrared?

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This is in Biology. We as humans can modulate our voices to mimic certain non-human sounds (ex: other animals, machines, electronics, etc...). Other birds like the lyrebird can also do it. My question is, can other primates/apes do this as well? Can chimps be trained to copy sounds?

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If it was touching the skin near the ear youd hear it. Just like bone induction earbuds. The sound would travel through the skin, then bone, to your eardrum.

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And why shouldn't indirect contact be suitable? Hold it in your teeth for example. I imagine something would even get through merely holding it in your hand.

You would expell a fine dusting of ice crystals and gas which would cause you to start spinning from the force of the gas expelled. You would then die painfully over a few minutes from exposure to vacuum.

With rising sea levels and lack of desalinated water, would it be possible to pipe sea water into a desert to add to rainfall and offset some sea level rise?

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so if you yell loud enough can you spit fire like a dragon?

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To poison things. Castor seeds are relatively large and would be a good source of food so there is strong pressure in favor of the plants who have seeds that are fatal to chew up and swallow. I cannot think of anything that ricin does that the plant would benefit from except for saving the lives of other seeds by killing whatever ate the first few.

Only if you find a way for the tuning fork to be in direct contact with your eardum

So just mold one while the shape is right against your ear 😁

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More specifically, when the plasma returns to a gaseous state, the extra energy is released as photons.