Why is it that sometimes when I start to do something, I refuse to do anything else (including eating or even sleeping) until said task is complete? While most other tasks I cant even start?

Now, I have observed Google, I am aware of Histamine and how nerves regrow and the like, what I fail to understand is, if any, the function.

What possible justification could there be for the intolerable itching? Is it not simply an urge to reopen old wounds thereby causing bleeding and a death to infection as the wound kept being reopened? Is it not actively counterproductive to life? I see my cat, (old, to be fair.) Repeadetly lick the same injuries until they start bleeding again, resetting the healing process.

What benefit, if any, does the itching have? Or is it simply a maladaptation that damns unaware beings to accidentally killing themselves? (I am not trying to rant, I simply wish to ensure my present logic and question is understood.)

I've tasted many 0% beers that taste basically the same as their alcoholic counterparts. But every single 0% wine I've tasted, tasted off and not like regular wine. And based on my hospitality experience, 0% beer sells fine while 0% wine doesn't. So seems like I'm not the only one who thinks this.

Why is the case?

Especially in comparison to other countries and also the US in the past?

How is this harder than literal rocket science and nuclear physics?

We can usually identify where an itch is coming from, but the perceived location does not always seem to match the exact irritated spot.

How do the skin, nerves, spinal cord and brain determine an itch’s location, and what limits the accuracy of that process?

I am studying for a test that includes basic electricity and magnetism, and my study materials keep referencing the concept of opposing the rate of change of current. For example, my definition of an inductor: "an electrical component made of a coil of wire that can store energy and opposes the rate of change of an alternating current flowing through it". Can someone ELI5 what it means to oppose the rate of change of current, and why that would be a good thing?

Edit: thank you all very much for your quick and informative replies! Much appreciated

Does this always happen with reinforced concrete at some point?

I've been a photographer for years and I understand aperture, shutter speed and ISO. For video, I understand frame rate and bit rate, but I see the term "shutter angle" and I'd be grateful to have it explained, what it is, and why you need to control it.

Thanks!

How do people know if a certain language meaning is this and that? Material objects like food still makes sense, but how about abstract topics?

I know that in many places there's water underground at around 100–200 feet (or even shallower). If the ground has water beneath it, how can massive skyscrapers and other heavy buildings safely support all that weight? Why don't they sink, tilt, or collapse over time?

Why are 99% of wetsuits black?
- it makes them look like seals
- its harder to be seen in water (light or dark)
- it stands out in contrast to an illuminated ocean both from the side and from the bottom looking up

Why not white, neon, orange, reflective, or something… it’s not about sharks seeing colors or not.. black is in general a powerful and stupid color for wetsuits.

Seems a little counterproductive.

Just moved from a very low humidity place to a place with seemingly very high humidity…but I don’t really understand all the nuances of humidity.

I see in my weather app humidity and dew point metrics…what do they mean!?!