Recent comments in /f/explainlikeimfive

saltedfish t1_je64cgs wrote

While the scope and the barrel may look parallel to each other, they're actually set at a slight angle to one another.

The scope is aligned in such a way that it essentially points horizontally. The barrel, however, is at a slight upward angle. This means the bullet, when fired, will arc upwards and descend in a ballistic arc. With a properly sighted scope, the bullet will intersect the scope's line of sight at known intervals.

This means if your scope is zeroed at 100 yards, and you aim carefully at the center of the target and pull the trigger, the bullet will actually rise until it is close to the line of sight (or above it, depending on the caliber), and then fall the light the target at the point of aim.

It's kind of hard to conceptualize because most arcs we're familiar with are very pronounced. The bullet follows an arc as well but it is very very flat. When you think of the flight path of a bullet in this way, and the scope as a horizontal line, where the two lines (the bullet's path and the scopes line of sight) intersect is where the bullet should go -- assuming the scope and rifle have been sighted to one another.

The handy part about this setup is that the scope can be deliberately adjusted off center by the shooter -- this allows the shooter to compensate for different ranges. If you know for instance, that your bullet drops one inch for every 100 yards it travels (ignore for a moment that this implies a linear path), and you know your target is 600 yards away, you can "misalign" your scope in such a way that it shoots high at 100 yards, but on target at 600. This is what shooters are doing when they're turning the knobs on a scope -- adjusting the crosshairs for both windage and elevation. This way they can put the crosshairs directly on the target instead of having to compensate manually.

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Korberos t1_je647er wrote

> a strange emotion to know that it likely would still be glorious if not for people fighting

Given that it's dedicated to Athena, god of warfare, and built specifically due to a victory over Persian invaders... it wouldn't even exist if not for people fighting.

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police-ical t1_je63poi wrote

Basically, yes. All prices are ultimately set by mutual negotiation. The problem with being an ordinary person in the current US drug market is that the pharmacy has already negotiated with insurance companies and signed contracts on the price of each medicine. To negotiate effectively and keep the lights on, the pharmacy must constantly press for higher rates, because the insurer will always press for lower rates. This constant arms race means the sticker price can be hugely inflated, while the insurance price is much lower. Both prices have very little to do with the wholesale cost of medication, which can mostly be made very cheaply.

Part of honoring that contract is charging that inflated price to anyone without insurance, because if they charged you $4 instead of $100 the insurer could sue for breach of contract, and refuse to pay more than $4. The pharmacy would actually love to still sell you medication at any profitable rate, but legally can't. GoodRx simply steps in to act like an insurer to negotiate rates, allowing the pharmacy to offer a discount that still makes some money. GoodRx still won't make branded drugs very cheap because the maker has a monopoly and there's no competition.

Conversely, a place like Cost Plus Drugs has its own suppliers for medication and doesn't work with insurance, so it can always charge a price that more directly reflects drug cost+labor+shipping+profit.

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MOS95B t1_je635ds wrote

Training. No scope (or hard sight) is 100% accurate at all ranges, because bullets don't travel in a straight line. Gravity will always have an effect. Bullets actually travel in an arc. Usually leaving the barrel (most notably in long guns/rifles) at a slightly upwards angle, and then start falling after a bit. Like this --

https://ke-courses-production.s3.amazonaws.com/asset_files/production/3766/attachments/original/muzzleloader-trajectory.jpg

And experienced/trained marksman (hunter, sniper, etc) knows how to compensate for this at various ranges

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hems86 t1_je62woh wrote

Scopes are zeroed in at a specific distance. You can choose what that distance is. Say 200 yards. You then go to a range and adjust the scope so that the round is hitting the target at 200 yards exactly where the crosshairs are aimed.

Then, most scopes have mil lines across the crosshair lines. Based on the ballistics of the specific ammunition you are shooting, use can use those mil lines to adjust for bullet drop and windage.

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Gnonthgol t1_je62wl2 wrote

The barrel and scope are not parallel. When the scope is perfectly horizontal the barrel is pointing slightly up. So at a set distance from the rifle the bullet will hit what the shooter is aiming for. But the bullet will also drop due to gravity over time so at a distance further away it will also hit. This is why it is so important for the shooter to get the distance right and then set the scope to that distance. If the target is closer then he thinks it is then he is going to hit high, and if the target is further away then he thinks he is going to hit low.

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Moskau50 t1_je62m54 wrote

The scopes can be dialed to a specific range. This changes the angle that the scope points relative to the barrel, so that the arc of the bullet (gravity pulls down on the bullet as it moves through the air) meets the line of sight of the scope at the prescribed distance. The higher the range, the lower the scope points, so the bullet has to drop further (meaning it flies farther horizontally) to meet the sight line.

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explainlikeimfive-ModTeam t1_je61k08 wrote

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homeboi808 t1_je5xu8s wrote

> Not sure what your dad's comment about insurance and equity have to do with each other, so either you misunderstood what he was complaining about or he doesn't understand something.

The escrow could have increased, so if they pay extra every month then the amount they pay extra would be less (unless they maintain the amount of extra payment).

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spicytakii t1_je5x472 wrote

I used to always think that it would be better to not restore it because if we did, it would lose that ancient feeling. I saw it as if we repaired an old painting; it’d have been touched by the modern world instead of being left alone as a time capsule from the past.

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SirMcCheese t1_je5vfv1 wrote

Since people have answered the other part well I'll try to explain the second part of the question. No Greece and Italy did not exist the entire time. Athens home of the Parthenon was a city state which ended up conquered numerous times the Macedonians, the Romans, the Byzantines (Eastern half of the roman empire after a split), the Ottomans all ruled or conquered the city at points. With the parthenon being partially destroyed while under Ottoman by an attack from the city state of Venice. Which is a nice transition to the fall of Rome. Rome was invaded several times even nearly being abandoned when the aquaducts (the cities water supply was cutoff). The Colosseum was damaged by earthquakes and fire with the Romans not repairing it due to their situation. The Roman empire eventually ended up with small regional powers like the city state of venice. Rome for much of this time was ruled by the Pope as part of the Papel States. There is a bit more, but basically no Greece, and Italy/Rome did not exist the entire time.

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KrazzeeKane t1_je5us67 wrote

I'm talking about the big multi-day festivals, which this would qualify as since it is 600k+ people lol. And those get real stinky, real fast when you have hundreds of thousands of people who have been physically active and dancing all crowd together outside. You can physically feel it lol

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Kingstad t1_je5tyhd wrote

We value these ancient things more now as they are older and we live in a world of relative abundance so we can give a crap about such things. Most ancient structures have suffered from locals repurposing the materials for whatever else. It might be more relevant for a structure to last long if people arent around to fuck it up, thinking about south american temples, Macchu Picchu, Ankor Wat.

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gromm93 t1_je5rwdw wrote

The Greek and Roman empires most certainly have not existed the entire time, and you're talking about extremely long timelines. Even if there was a sitting Roman emperor for the past 2500 years and the entire period had not seen a single invasion succeed, you're talking about a maximum 50 year reign for each emperor. That's 50 lifetimes. Now consider that many rulers during that period only lasted a few months and you might start to see the problem.

Try to find a building in New York City that's older than 100 years. Most of them just get torn down for being old and decrepit, and that's with our current engineering technology, using machines and materials that could never have existed in ancient times. Throw in regular earthquakes and other natural disasters that cause further damage.

Thats pretty much what happened to the Roman Colluseum. Several political leaders considered it a ruin worth only it's scrap materials, and used that stone for other building projects to save money. It certainly wasn't usable for its original purpose even 1500 years ago.

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