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84

All that gold makes gold virtually worthless so people would put it to practical use like construction. The Pantheon is held together with iron bars coated in lead to slow down corrosion. You could get better protection coating iron in gold. You can coat roofs in gold leaf for excellent waterproofing. The ancient Romans used lead pipes for water. Gold ...


78

I began to plan out various tactics and such, when I realized it was all for naught. Let's suppose they breach the perimiter of the base. They will soon face an unsolvable problem. They don't have heavy weapons or explosives. A base, supposedly high-tech, important and secretive will be built with nuclear bunker specifications in mind. The base personnel ...


66

Use their attraction towards magic to drown them into poop It's too exhausting to renew all these expensive defense mechanisms. There is one resource the kingdom will never run out of: poop. Let your drowning tank refills itself, as monsters are irresistibly lured toward the huge pile of magical artifacts you placed at the bottom of it. It is actually a ...


59

Assuming that the object is to protect earth, and not just hide away when the aliens come... Join the Department of Extraterrestrial Defense The Department was founded in the sixties, at the same time as the project to create a psychic supersoldier using LSD. Currently it consists of one insane bearded guy, in the 22nd basement level of the Pentagon. ...


55

The zombies are idiots. Zombies can attack or defend, but they can't attack intelligently, and they can only do both at once with a lot of attention from the sorcerer. In a fight, a skilled fighter (person A) is constantly assessing their opponent(person B) or opponents. Person A's goal is to hurt person B without being hurt in return, so person A puts a ...


44

There are a couple good answers already about how Paul can help the world prepare by sharing knowledge, or advancing technology. But if he is really prepared to consider any option, to take any action, there are at least a couple more options he should consider, whether or not he actually decides on using them. Take up Super-villainy Honestly, there is ...


42

The Power of Sports is useful, But Overstated I am a combat veteran of two wars and I found competitive sports useful to provide a distraction and work off excess anxiety and restlessness, but frankly there never was an Oscar worthy moment where the power of sportsmanship and football suddenly made all my problems go away. Military indoctrination, mental ...


41

Castles were useful for a certain type of defensive warfare. They allow you to project power over an area with a relatively small but immobile force. You could consider them to be primarily a delaying tactic, designed to hold up the enemy until such time as a significant force could be brought in. A good castle can be the deciding factor when a smaller ...


41

Not all threats are for violence. Countries often threaten one another with sanctions without going to war. To intimidate another group you just need the threat of an action which is detrimental to them, not necessarily violent. Use your technological superiority to take their resources right out of their hands, consume a nearby plant with your mining, or ...


38

The primary reason why gold is so valuable is because of scarcity. Once you eliminate scarcity there are many uses that gold can be put to. Chemically it is highly nonreactive making it a good fit for containing reactive materials and foodstuffs, and anywhere that you want a durable cladding that doesn't require much strength. It conducts heat well making ...


38

why invade at all? Most structures of a civilisation are probably going to be on a surface. It is, after all, more difficult to build underground than on a surface. That means that most items of value can be simply blasted from above. But you might not want to blast them from orbit because these items might also be of value to you. You might want to avoid ...


37

32 attackers, 221,968 distractions Coordinating a quarter of a million young men via Facebook event is a nightmare I wouldn't wish on my worst enemy. Coordinating search and rescue for a quarter of a million men stranded in the desert and dying of thirst is even worse. I fully expect the national guard to be deployed simply to deal with the humanitarian ...


32

Rule #1 of Storm Area 51 Club: Don’t talk about Storm Area 51 Club (SA51C) Secrecy and Surprise are important strategies in any act of Civil Disobedience Rule #2 of SA51C: Don’t carry weapons of any type. 1 rifleman can shoot a thousand civilians running across the desert. And, Close Air Support from a Spectre Gunship will ruin your day. But it ...


31

Zombies have no sense of self-preservation. If you tell a zombie to walk to the castle, they'll do it, even if there's a moat in the way. Or caltrops. Or fire. There is no difference between the actions of a normal zombie and a zombie on fire, unless given a specific order otherwise. A bleeding warrior will stop and get bandaged; a bleeding zombie will keep ...


27

There are some deep contradictions here, which probably have to be resolved before a plausible answer can be provided. No Instinctive Drives The first thing we need to establish is that a computer would not only have a moral code, it would lack all the sci-fi tropes of survival instinct, etc. so it's unlikely to kill its creator in an attempt to survive, ...


25

Medieval sieges had two components to them: Starve them out. We're talking medieval technologies, so farming isn't anywhere what it is today...more land was needed to feed people. If there was an ability to gain food and water during a siege by the defender, this becomes a pretty useless tactic honestly. As an extension to this, there is little to ...


25

I would like the reaction to the appearance of one of my nations navies to elicit a feeling of dread or fear Some answers have suggested sanctions and other such "pacifistic" approaches. I don't like these approaches, but you can try them. Just remember that Germany was France's #1 trading partner before WWI. My approach would be to be harmless but still ...


24

Mines could work if we stretch the definition of a mine. The problem with space is... it is big really big you just won't believe how vastly, hugely, mindbogglingly big it is I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space. Listen... So our mines can't be stationary as they'll hardly ever be in the ...


24

Every good hero has a fatal flaw. Even Superman has kryptonite, and is arguably kindof a coward. For your speedster, maybe he's not very good at forward-thinking. The non-speedster only has to set up some bait and swing his bat -- the speedster hits the bat every time, and at those speeds, the blow does a lot of damage. For that matter, your speedster can'...


23

TLDR: It's a matter of cost: building castles costs a lot, but assieging a castle also costs a lot. However, you need to control the castle in order to secure your supply line and/or control the region. As to the first point: sure I can escape into my eagles nest and be relatively safe as long as supplies last. But unless I have a sizable force at my ...


22

In medieval times and earlier, in any battle of trained units versus armed farmers the trained units indeed had fair odds of beating engagements that were 10:1. Zombies are not simply poorly trained units. They are completely untrained, disorganized, unled, and literally brain-dead units. Zombies don't suspect or prepare for an ambush in a spot that's ...


22

How to defend against the Spanish (Y'Ang) Armada 1. Have spies find out when the Y'Ang Armada is setting sail. This would make the situation a lot easier. In the case of the Spanish Armada, the fact that the Pope granted the Spanish soldiers indulgences and allowed King Phillip of Spain to collect a crusade tax was kind of a dead giveaway. The logistical ...


21

This is really a question of economics. Would such a device be practical to be produced in a large scale. I myself am a German economic historian, and I specialize in pre-war economies. Thus I will answer from the German perspective, as that is the only country which I can, in good faith, answer for. In short, yes. But the reason for it is striking. ...


20

Standing army is expensive. Both in money and in supply. Any medieval lord had a very limited amount of resources at their disposal at any given moment in time. Combined with the terribly inefficient logistics of the time, in most cases they just can't afford to keep the army in the field for a prolonged period of time. For instance, in 1066 king Harold ...


20

Not really. Blitzkreig has lots of pretty pictures of fast-moving weapons, but the real power of the concept was based on synchronization and a short decision cycle. Weapons and soldiers didn't really move all that fast at all. Example: In 1940, it took over 6 weeks for the German army to reach Paris. Synchronization can be thought of as the use of pre-...


19

Stealing a little from @DJClayworth's answer, this answer is probably too self-insert-fan-fiction-y to make a good story, but it is exactly what I would do: Tell Carl Sagan On September 28, 1980, PBS aired the first episode of Carl Sagan's Cosmos. It quickly became the most-watched American television program of all time for a decade until it was ...


19

We can add some real science back into this to help handwave some things. Science and handwaving, what fun! This speedster is fast, real fast, but where do they get the calories to burn for this speed? The faster they go, the more calories they need. Let's make a ballpark figure and say at full near light speed, they are burning 1000 calories a second. ...


18

Big Scary Ships If you can't make it, fake it. Enemies will leave you alone if they think you're a threat. Some animals make themselves appear larger and more threatening to scare off potential threats. Alternative, threats don't need to be violent. The right allies or the threat of loss of trade or the threat of secrets being released can be just as ...


16

That's a very small highschool. I assume that the class of 27 is just the class that survived. First, you must determine the total number of students that actually go to the school. Once you do, then you can look at the supplies on campus in the cafeteria. From there, you have to decide if electric is still working and if there's a backup generator. Because ...


15

Trade, economy, political power, WiFi password or defensive system 1) Trade. It does not only cover imposing simple embargo. It also covers informing all other powers, that they are fully free to choose whether they want to trade with you or with that rogue state, but regrettably have to pick one. (US did something like that with Cuba) 2) Political power. ...


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