255

Railway Maintenance Vehicle Ride on the tracks. They go everywhere and will be mostly clear. Obstruction on the tracks? Hop off and drive around it. Build a living space and storage space in the large flatbed area. Extra bonus: Crane Arm. Use it to clear paths, load supplies and fight zombies. Most models change modes with just the push of a button! You ...


232

They weather. https://www.livescience.com/18343-seal-mummies-antarctic-microbes.html Antarctica has dry valleys where, for some reasons, seals sometimes went. It is a bad place for seals, and they died. It is a bad place for microbes and everything else too, so the dead seals did not decompose. These mummies are hundreds of years old. The mummies ...


202

Assuming that it's purely random, let's consider where these people would probably be. Taking the percentage of the population each country represents, we get: China: 18.2% = 6.37 people India: 17.5% = 6.125 people America: 4.29% = 1.5 people Indonesia: 3.43% = 1.2 people Pakistan: 2.78% = 0.93 people ...etc. The percentage keeps going down. This means ...


187

It's HF radio, or nothing The odds of anyone meeting again are almost exactly equal to the odds of at least two being either radio hams, or able to learn the skills from books. The population density of 35 people worldwide is so extremely low that the odds of finding someone without the benefit of global communications is practically zero. Strategies like ...


159

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 are becoming more fashionable, it's not unfeasible that within a few decades we'll have implants in our brains for interfacing with computers. As with all ...


134

Nothing. 30 million years ago Antarctica developed its ice cap. The Alps STARTED to rise in Europe. The place now known as South America detached from Antarctica and started drifting toward North America. The Great Pyramid of Giza was built around 4500 years ago. 30 million years ago that part of Africa didn't exist. To give extra perspective. The WHOLE ...


126

The remains would mummify, petrify, erode, and eventually become just another mineral layer. Where water is available the organic remains will dissolve and be replaced with inorganic minerals to form fossils, and if no water is available the remains will desiccate and be preserved as mummies. There wasn't much specification regarding the timeline or ...


111

What about a boat? (zombies can't swim right?) Europe has a pretty good river system and will get you to pretty much every big city. The two mechanics will have to deal with operating locks along the way, there's always a manual override. You can go with a group of two or three motor yachts or one large river cruise ship or converted freighter. Boats are ...


106

I think chickens will duck extinction (pun intended), thanks to their adaptability. When I was a kid we used to have chickens in our farm (surrounding environment was Maquis shrubland), which were left roaming free during the day. We also had predators in the surrounding (foxes, badgers, weasels, snakes), and, quite surprisingly, they managed to kill ...


104

Your time frame is way, way too long. Aircraft are incredibly complex machines; let's review a few of the failure points. Fluids: Your first failure point is likely to be fuel. OK, technically the batteries would drain out first, but if you have fuel you can get those recharged in most cases. Your limits look to be around 12 months to 2 years (jet fuel is ...


94

I know you want proper booby traps, but I doubt they would be the biggest dangers or challenges of invading a military base. Security measures would have a far larger impact. Firstly a 1 meter thick steel door should make it extremely hard to get in. With the electronics degraded and any ball bearings and grease long gone you will literally have to drag ...


93

What about bicycles? They're quiet, they don't require finding fuel, they're maneuverable, they're easy to repair even for laymen, they can be used in multiple different types of terrain, and they're fast enough to outrun a traditional zombie hoard.


92

Squirrels Working IT for several years, I have learned that if any rodent will mess with Comms, it's a squirrel. They are the triple threat: breed quickly with nesting, climb all man-made structures with ease, and seem to hunt out power/comms lines. I have treated cases of squirrel problems that include the following: Squirrel chewing through backup ...


87

It happens that in 1986 I participated in the cleanup after the Chernobyl catastrophe. I worked as a radiation measurement specialist 20 m below that blasted 4th reactor. I worked at the station for the whole July. It was the worst time, for the radioactive dust levels increased till the finishing of the Sarcophagus. As we had only masks as protection (but ...


85

Mongrels There is no reason to think that left to themselves, dogs will remain in breeds. They will cross breed. In a few generations, there won't be any separate breeds. All dogs will be mongrels. There may be some specialist types. For example, smaller dogs may specialize in hunting in tunnels (e.g. rabbit warrens). The largest dogs will likely ...


84

The current answers are assuming you mean from 2018 human cities. Since it will probably take some time for our ultimate demise, some technological advances could take place that would allow a species 30 million years later to detect human presence. It is lucky that a resourceful and vain group of scientists thought of this notion in 21XX. They developed ...


81

If you're happy taking a while to do it, just keep being you. You're an immortal in a tribal society that will have a very short lifespan. You alone can go outside into the wastes and bring back new tech, food, whatever. You alone can walk into an enemy village and not be killed. You alone remember the wisdom of ages past, and remember the histories of the ...


81

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 stimulates puberty is the Gonadotropin-releasing hormone. GnRH is a neuro-hormone and stimulates certain behaviour patterns, the hormone influences a person's ...


77

Try to use Radioluminescence Radiation is quite difficult to detect in low-tech environment, and because humans are among the species most vulnerable to radiation, it will be challenging to find any other organism that would serve as an indicator. However, if primitive people can synthesize radioluminescent phosphor materials like zinc sulfide, they can ...


74

In order to get water up to the top of a building, you can either carry it manually, or you can pump it. Pumps don't have to run on electricity. Wind-powered pumps use a windmill to power the pump, and have been used since at least the 1500s (and likely much earlier) for irrigation and other purposes. Other options like steam power, diesel, or water wheels ...


74

The crucial question is what they do with it. As a museum piece, it's not really dangerous. If they open it up, bad things can happen. This answer assumes that we're talking about a two-stage thermonuclear device. This has a couple of main components: a primary fission charge, a secondary fission and fusion charge, an interstage, and a tamper. The primary ...


65

Cockroach Farming is the future! They feed the roaches wheat shavings and vegetables for four months. Then they're boiled, dried and some are crushed to put into pill form, which is much easier to stomach. Cockroaches are omnivorous scavengers and will consume any organic food source available to them. Although they prefer sweets, meats and starches, they ...


64

The Obvious Essentials Canned goods. They last for years and are likely to be more enjoyable to the modern first-world human palate than the new meals you’re going to be growing or hunting. They’ll make a good meal supplement as people adjust. Medication and first-aid supplies. You want anything and everything you can find. Fabricating medication after the ...


63

I'm going to respond to this with a framing challenge, because as it stands I think you're asking the wrong question. The issue is that the modern industrial world is a product of population DENSITY rather than total population. This may seem semantic but in a post-apocalyptic environment it's very meaningful. Modern industrialism depends on and benefits ...


59

A super low tech alternative approach. Stairway to heaven. Build a nice tall stair case going from ground level up a good 5 or 6 floors then hang a birdcage a good 6 or 7 feet off the edge of the top landing. Maybe even hang some shiny bells on the cage. Just need enough noise and motion to keep the zombies motivated. How does it work? Well... Zombies ...


58

This is actually easier than you think, and represents a major shortcoming of our modern civilization - specialization. First and foremost, it's safe to say that all traces of human civilization on Earth are now well and truly gone. In other words, no one is going to find caches of technology or resources just lying around. Second, consider that the ...


54

Short answer: Yes Long answer: Yes, Easily. Switzerland has considerable reserves in case of worldwide non-swiss rapture (or because if their neighbours decide to screw them they've got no other alternatives), so they're OK in the short term. However: They don't produce all of their own power (they make roughly 50% of it) and they don't produce all ...


54

The oldest pump in historical records is the force pump. The book that first describes it was written between 15 and 30 B.C/B.C.E. This is the Archimedes's screw, which is one of my favorite ancient machines. It was used for irrigation. These could be arranged within a building's staircases. And then there is always the classical bucketwheel. All of the ...


54

This is an interesting question. Obviously, just walking about and hoping to meet someone is fruitless, the chances are just ridiculous. What you would want to do is communicate. Now we know how many people survived and what the likely distribution is, but they do not. From the perspective of a survivor, everyone around is suddenly dead or disappeared. ...


52

You have to look at the situation realistically, and realize that equality is going to become an even more complicated topic than it is today. The Reality Civilization - as we know it - is gone. Technology, the great equalizer, is gone. You now live in a world where might is right. If I'm stronger than you I'm in charge, and I take your stuff (maybe even ...


Only top voted, non community-wiki answers of a minimum length are eligible