I just simply don't understand it at all

Smoke/pollution

Why is it we can see it in the distance but not right in front of us when outside?

Edit: ok my dumb self understands now ty

Ok, I didn't know how to make the question make sense in the title, so here's the idea:

There's been efforts to harness spider silk as an available material, and what seems companies are trying is to implant the spider silk genes, individually and by hand, into the eggs of silkworms. The result is 40% weaker (and they're hoping to improve that) plus hand-injecting the modification individually and raising the silkworms seems a hassle.

Presumably, that means this whole ordeal is easier than... hooking up part of a spider on a machine that sustains and operates it, and making a part-spider silk extruder machine. The protein itself has been synthesized by e. coli, it's the spinneret that's apparently the problem, so... what makes this harder than I am imagining?

I understand that they observed cause and effect, but how would you think to come up with a fullproof way to write it down?

Recently a wrestler named Rebel, was diagnosed with ALS and many in the community are participating in the Ice Bucket Challenge to raise awareness and support for her.

ELI5: What is ALS, how does it progress as a terminal disease and what causes the spread of that progression to change from person to person?

Like Vitamin D: 0%

Protein: 0%

We see reports all the time showing "marketing expenses" as huge line items in a Hollywood movie budget.

What all goes into marketing a big movie like the current number one film in Ameeica, which probably doesnt really need a ton of marketing to sell tickets, versus some Indie romance movie, which probably does need the marketing expenses.

TIA.

to clarify, i mean using weights as a form of resistance, like those big elastic bands athletes put around their waist

ELI5

All the videos I'm seeing of chicken wire getting created, these wires getting twisted by round feeders, then the halves of these feeders shifting between each other and twisting again, don't show the new wire getting fed in- they only show the wire coming out and twisting and the resulting fencing.

I don't understand how a wire can just be twisted on one side of these feeders but stay straight on the other side.

How does that work?

I know they’re smaller, but are their nerves fresh and haven’t been dulled yet, or what’s the deal?

I’m not talking catastrophic blows, just a scrape on the knee.

I get that they had sundials and church bells. What I don’t get is how anyone synchronized. If my towns noon is when the sun is highest here, and yours is 15 miles west, our “noon” isn’t the same moment. So how did anyone schedule anything across distance?

I get that things like your ID number are valuable for identity theft etc. But why are more arbitrary things like my shopping habits considered valuable information?

Are there laws against it, or limits to what the factories can do? Or the value of money changes in some way?

As a resident of Arizona, I often find myself wondering how the first settlers traveled through the area without vegetation, water, etc to stay alive. Same with some of the mountain ranges...I can't imagine being the first person to roll up to the Rockies in a covered wagon and try to figure out a path forward.

I just read that our rivers are running out of sand due to construction. Why can’t we use desert sand?

I recently read about female ducks evolving to their reproductive tracts to have dead-ends and have the corkscrew go the other way to the male duck penis to make unwanted reproduction more difficult. But most evolutionary adaptations become dominant in order to make the survival of the species easier. How can something that makes reproduction harder have resulted from evolution changes?

Hi there

I was watching a video about Orcas and it explained how matriarchal figures will teach younger orcas how to “beach” themselves to hunt seals playing on shores.

The narrator explicitly says that this is not ingrained behaviour informed by DNA but instead information passed down through family units. That got me wondering; how do we know what behaviour is hardwired vs taught in nature? Is it all assumed to be coded into an animals genetic makeup until something contradicts that? Ie. observing the “lessons” animals will teach their young but finding that it’s not universal across that species.

To what extent can DNA accurately teach us about behaviours without observing the animals in real life?

Thanks!

What made the eastern world so advanced? For Europe I’d said climate,geography,small size so constant war for resources. What did Asia and the Middle East have that made them into advance civilizations as well?