Earth has a much more active surface than the moon. Plate tectonics constantly recycles crust by burying it and making new crust, weather erodes crust, etc. Granted, this is a slow process, but it took the moon billions of years to look how it does today, because those processes don't operate there. So there is virtually nothing to erase those craters.

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I think little space debris that slams into the moon at astronomical speeds does not make it through to us because of our atmosphere. We do have huge craters on earth, so inevitably we will have another. I wonder when.

Earth is geologically active. The moon is not. Volcanoes cover and "heal" those craters. We DO have them but they're far less pronounced.

Well for one thing the earth does have craters, but they’re often underwater, but the earth also has a thick atmosphere (compared to the moon’s) which breaks up most of the asteroids before they can do much damage to the surface of earth.

It’s also why it’s good practice to pull the drive out of the computer when throwing it away/recycling it, and then destroying the drive.

imagine you're playing in a sandbox at the playground. you have a corner to yourself and you built a sand castle. This is a computer taking up memory.

Your mother tells you it's time to go home. you leave the sandbox, but you don't knock down your castle. it stays up after you leave. this is memory being deleted.

Your sand castle will stay up until another kid comes to knock it down, so they can build their own thing. This is memory reallocation.

Standardized...

Not always . There are still a few places where a horizontal layout is used.

First off, we were born into it. Honestly, if we didn't have about 14 pounds per square inch pressing down on us we'd suffer and possibly die. That pressure keeps our blood from boiling and oxygen from leeching out of our lungs. Our bodies exert about that much pressure on the air around us and that keeps things balanced.

Second, air pressure hits us from all directions equally. Yes, the air is pushing you down but the air underneath you is pushing you up. You're being pushing forwards, back, left, and right all in about equal measure so the net effect is just a gentle squeeze rather than a crushing force.

Because it evolved to do so. All life has evolved on this planet under these conditions so as organisms got larger and more complex, that came with it the necessary internal and external structures to survive in the conditions of its environment.

Don't forget that life came from the sea where the pressure is even greater.

And also don't forget that we aren't sealed tight. We establish an equilibrium with our environment.

Crazy to think all that air only weighs so little. So is it water in the cells creating this outwards pressure?

This is a huge pet peeve of mine. My non-computer illiterate friends me ask me, “How can I clear up my memory? It’s full.”

You can’t. You can’t clear up memory like you do with storage. Memory and storage are two distinct things. They don’t understand the difference.

Most of my friends don’t ask me computer questions anymore because I get all pedantic on them.

Well that’s scary. Thank you for this TIL!

Yes, I have a form of red-green colorblindness and I see traffic lights just fine.

Why are the memory addresses abandoned rather than covered over with 0’s?

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Many drive cleaner tools will have a tool to wipe free space. They write over every bit that is not occupied with 'undeleted' data or stuff you're using. They replace everything not in use with new junk data that could just be 00000001 for every bit. This takes a fair bit of time but doing this a couple of times can remove any trace of what a specific bit says or even used to say.

If you save somethinn as 'file.name' and it's contents are 00000111 then delete it, it stays as 00000111, but if you delete it then wipe free space it changes that 00000111 to something useless.

This is the reason I will NEVER sell my old computers with old hard drives even after clearing them of the data.

But with few full formats and rewrites you sjould be ok, I'm just paranoid.

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Technically magnetic fields are also radiation and both scanners / detectors use electromagnetic radiation, albeit of different frequencies.

Red is at the top.

If you're close enough to a light that you have to obey it but can't distinguish the top from the bottom you've got bigger sight problems than colour blindness and probably shouldn't be driving at all.

Not perse. In that case you're erasing/reusing the ledger entry, but the 'new' file may get written on a wholly different location depending on how the OS works. But yes, it CAN work the same, if the new file overwrites the exact same spot as the old file. Most OSses work that way.

There are many environmental conditions, especially at night, where you see just a light and not the rest of the fixture, so if you don't know what color it is you can't determine if it's the top or bottom. It usually becomes apparent up close but until then you would need to guess whether you should be stopping or not, and we don't need people guessing on the road.