160 votes

How could an apocalypse kill off all adults -- leaving only those under the age of 18?

My line of thinking is this: If you want to kill everyone over 18, it should ideally be linked to something that only those older than 18 are able to do. Computers are getting smaller, and wearables ...
Callum Bradbury's user avatar
131 votes
Accepted

How to survive the heat death of the universe?

Get out I mean, literally. As in "get out of the universe". The heat death of our universe is by definition not a survivable event. That's the bad news. The good news is that it takes a very, ...
aroth's user avatar
  • 2,432
131 votes
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The land grows evil and corrupted ... but why?

The volcanic gasses that fill the valleys near the Kikhpinych volcanos kill anything that stays in it for too long and poisons everything else that venture into it. Larger creatures like humans are ...
John's user avatar
  • 81k
105 votes
Accepted

Why don't future civilizations develop their A.I. to integrate with biology so they can make a sustainable world?

I work in the AI field. The fictional shows are not realistic, the authors do that for the sake of creating a powerful enemy that seems unstoppable, so the puny humans can be heroic in the eyes of the ...
Amadeus's user avatar
  • 34.7k
100 votes

How to survive the heat death of the universe?

No. By definition the heat death is the state where you could no longer do anything. Any actions you do before it only makes it come sooner. Best strategy: Sit still, do absolutely nothing. (I kinda ...
SE - stop firing the good guys's user avatar
100 votes

The land grows evil and corrupted ... but why?

An invasive species would meet all of your requirements, but for a true corruption I would go for an invasive zombie fungus. Meet Ophiocordyceps unilateralis a tropical fungus whose spores infect ...
Josh King's user avatar
  • 24.9k
86 votes
Accepted

Would a trench filled with mercury stop zombies in their tracks?

You would need roughly 62500 cubic metres of mercury. One cubic metre of mercury is 13,534 kilograms. So you would need to mine 845,875 tons of mercury. In cinnabar there is 12% percent of mercury. So ...
SZCZERZO KŁY's user avatar
81 votes

How could an apocalypse kill off all adults -- leaving only those under the age of 18?

There's no clear dividing line between a person aged 17 and one aged 18. However, before puberty, the human body has significant differences in the release of hormones. The primary hormone which ...
Feyre's user avatar
  • 2,098
78 votes

How to survive the heat death of the universe?

Hard physics answer I think the question is fundamentally ill-posed. As long as there are humans alive somewhere, the universe is millions to the power of millions of years away from the "heat death" ...
semi-extrinsic's user avatar
70 votes
Accepted

How to be hidden from world for a year

If you're a billionaire and already under the focus of the TLA Agencies, best how to disappear for a year is... not to disappear. If you'd suddenly disappear from today to tomorrow a dozen of alerts ...
Alexander von Wernherr's user avatar
69 votes

Why would the tribes choose herding instead of agriculture in the Great Plains?

Sedentary Lifestyles aren't Necessarily Easier The problem with being a sedentary farmer is that once you get your seeds in the ground you now have a long standing commitment to care for that plot of ...
TCAT117's user avatar
  • 21.1k
67 votes

The Earth is teleported into interstellar space for 5 minutes. What happens?

Absolutely nothing happens except that it's night for about 5 minutes everywhere on Earth. It would take several days for the tides to even out. It would take several months for the foodweb to ...
stix's user avatar
  • 5,913
66 votes

Why would the military use tanks in a zombie apocalypse?

It's the mounting platform for your flail. If you pull the tank battalion's mine flail (video) out of the back of the motor pool and put it onto the tank, you can shred your way through lots and lots (...
user535733's user avatar
  • 28.9k
64 votes

Why would The Machines not hunt humanity?

Because their programming doesn't allow them. The most likely way for a realistic AI to become "hostile" to mankind is because it learned something in a way we didn't intent to. As an ...
Demigan's user avatar
  • 45.4k
57 votes
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How long could a nuclear warhead remain functioning underground?

No, on a variety of fronts So, first of all, there's no nuclear warhead ever developed that will last six hundred years, for a variety of reasons: High explosives (required as the triggering device ...
jdunlop's user avatar
  • 32k
53 votes
Accepted

What kind of land transportation can be used for plowing through hordes of zombies?

Frankly, I would not bother with cars or trucks. Use a train! Any large diesel engine, or several combined, with a snow plow up front. As a bonus, you can add waggons for any goods you may want ...
Burki's user avatar
  • 12.8k
51 votes
Accepted

What is the ideal location to hide the President in the case of a zombie apocalypse?

Why would you want to hide the President? That concept makes sense if there is an attack by an intelligent adversary who wants to target the chain of command. In this case, it sounds as if you want to ...
o.m.'s user avatar
  • 115k
50 votes
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What kind of apocalyptic event can be predicted years before it happens?

I think global warming should count. It is not a dinosaur killer asteroid type of apocalypse but is definitely a world-changing grief-causing life-altering megaevent. And one that fits the OP ...
Willk's user avatar
  • 305k
50 votes
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Why would The Machines not hunt humanity?

Because they think that humans could be useful in the future After losing the war, the humans still pose a threat to the machines, but not an existential one. They are just a nuisance. But the ...
McTroopers's user avatar
  • 7,459
48 votes
Accepted

Will unattended nuclear power plants actually cause damage to their surroundings?

No, probably. Here's why: Nuclear power plants will be unlikely to go into a meltdown scenario in the event of operators' absence. After several days, most will shut themselves down if they have ...
Rugnir's user avatar
  • 899
48 votes
Accepted

What would happen to a modern skyscraper if it rains micro blackholes?

would it triggers extinction level event? Since they'd evaporate more or less instantaneously (known as Hawking radiation), releasing energy according to the famous equation beginning E=, the ...
Escaped dental patient.'s user avatar
48 votes
Accepted

Could human civilization live 150 years in a nuclear-powered aircraft carrier colony without resorting to mass killing/ cannibalism?

You have problems, and it isn't food Food is easy. The ocean is full of fish. So long as your story places the aircraft carriers in the right place, food is irrelevant. Your problem is nuclear ...
JBH's user avatar
  • 122k
47 votes

Can a dedicated amateur astronomer spot a rogue asteroid?

The sky is too big to let only professional astronomers look at it. Consider that professional telescopes have limited time windows for specific researches. And if you want to spot potential hazards ...
L.Dutch's user avatar
  • 287k
47 votes

Why would an army of angels with air superiority fight demons on the ground?

This sort of question comes up quite often in warfare. The answer is simple: the demons have found a way to nullify the advantage of attacking from the air. This is a very common approach in warfare. ...
Cort Ammon's user avatar
  • 132k
45 votes

How to be hidden from world for a year

By doing it every couple of years in some totally innocent way. Some years you spend sailing in the Southern Ocean, some years you spend 6 months skiing in the Alps or solo trekking across the ...
Separatrix's user avatar
  • 118k
44 votes

What is the ideal location to hide the President in the case of a zombie apocalypse?

Fort Knox Contrary to popular belief, Fort Knox is not just the location where the gold is stored. That title goes to the United States Bullion Depository. Fort Knox is actually a 109,000 ...
TrEs-2b's user avatar
  • 56.2k
44 votes

The land grows evil and corrupted ... but why?

A Mazuku is probably your best bet. A Mazuku is essentially a "blanket" of carbon dioxide that is released by any number of natural events, such as volcanic activity, landslides, tsunamis, or from ...
Aify's user avatar
  • 19k
43 votes
Accepted

What is a reasonable time for modern human society to adapt to dungeons?

Assuming these dungeons have appeared in countries with modern military industrial complexes 48 hours to fully contain 72 hours for the first submission for planning to automatically turn anything ...
Separatrix's user avatar
  • 118k

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