So we’re just spreading trash in the environment and feeling good about it because it can be reused by other animals?

Sometimes it just works. Small octopuses love to take up residence in a beer bottle. It might not be the prettiest thing to find on the ocean bottom but it's often home to one of the most intelligent invertebrates.

And, after all, that glass is just congealed sand.

people used to think that you could get infected with HIV by kissing and hugging.

You can, possibly, get it by kissing. If both kissers are frenching and have bleeding mouth wounds, HIV might be transmitted.

But people used to also think you could get it from toilet seats or even just shaking hands (a practice I'm not fond of for other reasons).

a manual particle collector (broom) and a manual particle shifter (shovel).

Secondary reply: I don't know If I'd call bald eagles smart. When I drive by a road kill that has vultures and a bald eagle feasting at it, the vultures fly away from the road while the stupid eagle flies right in front of my car. I've nearly had them smash into my windshield several times. It is now my standard reaction to slow down if I see a bald eagle eating road kill. I don't worry about the vultures because they know what to do.

BTW, bald eagles were nearly driven extinct by DDT. We quit using that so bald eagles are now numerous enough that I have to brake to keep from hitting while they eat road kill despite the lead poisoning.

Not denying the condor thing. Still didn't answer the vulture thing. Yes, I know condors are a type of vulture but so are black vultures and turkey vultures which are more common than ever.

Bug zappers don't focus on mosquitos. They focus on bugs attracted to light. Mosquitos aren't particularly attracted to light. They are attracted to body heat and, most particularly, carbon dioxide. Our exhalations draw them near. Then the heat from the veins close to the skin's surface provide the fine tuned target. So, to attract mosquitos, emit carbon dioxide which then draws near to a body temperature heat source, which then zaps or drowns them. This drowning is accomplished by having the mosquitos attracted to a suction which then blows them into water with a bit of soap in it.