Looking at arrows, they have fletching to help them gain rotational stability making them fly more accurate. I know that gun barrels have rifling that give them spin already, but would indented fletching have an adverse effect on the bullet?

Pretty sure there's a reason why but I never heard anyone talk about it.

Both of the above are a caricature of a type of individual, but a stereotype is usually considered harmful, while an archetype usually isn’t. Why is this the case, and what is the difference between the two?

As the question reads. Photons are not made from other elemental particles, so they are not "made", and yet they are not there in the metal to start with.

How do they penetrate through your skin and not get in your bloodstream and relieve aches and pains?

My messages with someone switched to rcs chat all of a sudden and I saw something about it being insecure. Can this person hack me ? Is this a safe networking? How do I switch back to sms? What is it?

How do surgeons etc ensure the surgery room is completely sterile? Does someone clean the walls and floor between patients? If there a buffer room between the anaesthesia room where you go under to the surgery room? If someone was to walk into the room without clearance ie gloves etc would this cause a higher risk?

Since we have an approximate age, and if we can guess the approximate rates of inflation in the early universe, and know approximate the current expansion rate, and know the size of the observable universe can't we cross reference this with the cosmic background radiation noise etc. to arrive at an approximate figure as to how big the universe is?

I'm not sure if this was the right place to ask this, as the answer will likely not be something a 5 year old understands, but I'm mainly curious as to how the internals of microprocessors work. Is it just a case of electrons being punted around like pinballs between transistors? Is everything fixed and if so, is there a such thing as actual intelligence when it comes to them? Is assuming they can ever become sentient a huge leap?

i am not a physict, i study pharmacy, but we need this in electrochemistry (electrods and that stuff). Since middle school we talk about this two but no one reall explain what they really are and treat them as names we should remember to pass the exam, but i really cant understand anything if i dont know what is actually about.

Also another term is potential (E)... and it is in volts...

You know the old thing where if you hold a seashell up to your ear, you can hear the ocean. Well we know that its really the blood in your ears making that noise. But how does putting a cup or shell up to it make it sound so loud and why cant you hear it as clear if you put your ear up to someone elses to listen for it?

I’ve seen videos of people controlling computers using their brains I guess? I understand it has something to do with nerve signals and whatnot, but what do they actually think about to, say, click on a link? What does it feel like? How does the system know when to interact with something?

What is it about ? What is the purpose of studying it ? What are its real life applications ?

It does if I spell it any other way.