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Can a gunsafe survive a nuclear blast level attack?

As specified, this question is trivial - you're saying that a thermonuclear weapon is going off within nine yards of the safe. Though there's variation, a relatively typical thermonuclear weapon in ...
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Can a gunsafe survive a nuclear blast level attack?

Steel may not remain solid within meters of a nuclear explosion The safe is not “extremely strong” at all. The model is likely Liberty Safe Co.'s Freedom 30. According to the specs, the save is ...
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Antiballast for flying ship

Volume-based Adjustable Buoyancy The key here is to not use so many stones that your ships float up. Instead, use as many stones as is needed to make your ship effectively weightless. If 1kg of ...
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What is the best ways of cleaning/bathing inside an astronaut suit?

Rotate troops often enough and it's a non-issue. In a system of earthworks, the fire-trench where the action happens is only the outermost layer of a complex tiered system of trenches, bunkers, and ...
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Accepted

What would a spacefaring race use as fuel for their matter-to-energy reactors?

Mine tailings: In your scenario, you can destroy matter. But even waste materials for your civilization out in space are made of the things you find valuable. In space, people are interested in places ...
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Antiballast for flying ship

Harvest extra ballast water from clouds. The Graf Zeppelin did this in real life during the 1930s. A set of gutters on the side of the vessel collected the water. The airship brushed against the edge ...
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Does this alternate Universe with easier-to-understand physics behave the same as ours?

Technobabble is Technobabble No, this model of the universe as a cellular automaton cannot be reconciled with the basic behavior of our real-life universe. Let's take a simple example, exploring a ...
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What would a spacefaring race use as fuel for their matter-to-energy reactors?

Solar Wind Converting Mass to Energy creates such a crazy amount of energy that you barely need any mass. One kilogram of matter has ~ 25,000 Gigawatt-hours of energy. Since a normal US house uses 10,...
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How could humans repeatedly lose their latest memories

Backup Restoration In a far future world, people make backups (periodically, perhaps daily in a hazardous environment) to protect their memories and identity in the case of their body being killed (...
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How could humans repeatedly lose their latest memories

This effect is a common one for people who have had clinically safe doses of opioid drugs like oxytocin and fentanyl. It is really quite remarkable to see it play out in real life with people who have ...
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Accepted

Would two people standing on opposite sides of a flat world be able to see the same constellations?

Depends on how close to the edge they are Overlapping fields of view of two observers on opposite sides of a disk world. The field where both observers can see an object is purplish sector; note that ...
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Would two people standing on opposite sides of a flat world be able to see the same constellations?

The part of the surface going from their feet to the edge will shield vision of part of the sky, so their field of vision will only partially overlap, as you can see in the below schematic. The ...
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Suppose an array of mirrors 50 km above the surface reflect light straight down. How long before the sun rise are they illuminated?

From a height of 50 km, the horizon is at about 800 km. At 45 degrees latitude, 800 km is about 10 degrees of longitude. The solar time 10 degrees of longitude away is about 40 minutes ahead or behind ...
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Are Mass Effect "style" guns possible?

The answer is "no," but just how it fails depends on the details. If the projectile is a "shaving", a curved sheet of material, rather than axisymmetric, then it's going to be ...
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Antiballast for flying ship

The stones are expensive, so you dont add so many that the ship becomes weightless. You essentially build a Heavier-Than-Air airship. It will naturally float down if nothing is done, but by the use of ...
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Accepted

Would compound-like eyes that gave a "pixelated" image be possible/practical

. . . meaning only light reflected from a narrow angle from the front of the ommatidia would get to the second half where all the photoreceptor cells lie. An obvious difficulty is that this kind of ...
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What would a spacefaring race use as fuel for their matter-to-energy reactors?

First it might be a good idea to ballpark how much matter you would need. From Newtonian physics it takes about $62$ megajoules of energy to get a kilogram completely off planet earth, so 2 kilos ...
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Accepted

Is it possible to build a transmitter small enough to fit inside of a .45 caliber bullet?

Yes, it surely is. The radio proximity fuze as used in the Second World War functioned after being fired from (in the example image at the link) a 40 mm Bofors gun, despite requiring an onboard ...
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A person in the air being struck by lightning

A lightning discharges through the path of minimum resistance. In a process not well understood, a bidirectional channel of ionized air, called a "leader", is initiated between oppositely-...
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Does this alternate Universe with easier-to-understand physics behave the same as ours?

Fundamentally no. Our model of physics is the simplest one we can pull off that explains as many of our our observations and experiments as we can. If a simpler model that would predict the results of ...
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Can Mars disintegrate entirely in this scenario?

One part of the question says: Before the fly-over, Mars's rotation can be accelerated to up to 1 Martian day per hour if that helps Mars to disintegrate. Would that help Mars break up into pieces? ...
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How could humans repeatedly lose their latest memories

You can use the following facts from neuroscience: Perhaps the most famous patient in neuroscience is Henry Molaison (patient HM) who had his hippocampi and surrounding regions surgically removed in ...
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Would compound-like eyes that gave a "pixelated" image be possible/practical

The image might be pixelated, but vision will not be. Our brains do a huge amount of processing of the "raw data" that comes from our eyes, and presumably, your organisms will do the same. ...
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How could humans repeatedly lose their latest memories

Anterograde amnesia This is a form of memory loss that prevents an individual from forming new memories of things that occur after the specific event that caused the amnesia. Importantly, memories ...
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Industrial scale Tritium production from Helium3?

So, especially in the outer solar system, where refining Helium3 from the atmospheres of gas and ice giants is rather trivial If you first assume that extracting and exporting stuff from the ...
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What would a spacefaring race use as fuel for their matter-to-energy reactors?

Waste. Landfill sites are expensive to set-up properly. The sites can eventually have housing built on them, but not without extensive plumbing to allow methane and noxious gasses to escape safely. ...
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A person in the air being struck by lightning

Being hit: Plausible. Surviving it: Plausible? You might be interested in the story of Zhongpin He, who was sucked into a storm while paragliding and later found dead. Lots of things could have killed ...
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