Search found 704 matches

by p1t1o
Fri Jun 09, 2017 1:04 pm UTC
Forum: Science
Topic: Very, very, very SLOW meteoroids.
Replies: 15
Views: 3410

Re: Very, very, very SLOW meteoroids.

I know I'm late to the party but this is the greatest thread ever! The answer is so hard to find on the internet. I always assumed it was just a shooting star moving directly toward me as the user ajd007 suggested in his reply. My question is this: I get why satellites would flair into existence (c...
by p1t1o
Fri May 26, 2017 3:44 pm UTC
Forum: Science
Topic: Superconducting CPU?
Replies: 66
Views: 3379

Re: Superconducting CPU?

According to Landauer's principle computers have to dissipate a certain amount of energy when they 'forget' a bit of information. This is a very small amount of energy, about 2.7e-21 Joules per bit at room temperature. At superconducting temperatures it would be considerably less, but I think that ...
by p1t1o
Fri May 26, 2017 2:28 pm UTC
Forum: Science
Topic: Superconducting CPU?
Replies: 66
Views: 3379

Superconducting CPU?

Could there be such a thing as a superconducting CPU, which drew no power and produced no heat?
by p1t1o
Tue May 16, 2017 12:29 pm UTC
Forum: Science
Topic: Why haven't any animals evolved wheels?
Replies: 22
Views: 2445

Re: Why haven't any animals evolved wheels?

tl;dr - because nature didnt produce roads/legs are better. Wheels not a great choice if the terrain is varied. Wheels great for flat, smooth places, and great for speed - but there will be very many places you cant go. The animals with legs will outcompete you every time. Legs can go over rocks, in...
by p1t1o
Fri Apr 28, 2017 7:54 am UTC
Forum: Science
Topic: Aerogel
Replies: 28
Views: 5959

Re: Aerogel

So apparently someone has had this idea before. I'm not really seeing much on actual aerogel on the site. I think they produce a coating for resealing old balloons that is maybe kinda-sorta an aerogel? Irritatingly enough, I think their name is a smashing-together of "angelic" with an &qu...
by p1t1o
Thu Apr 20, 2017 4:10 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 1448

Re: Safe electrolytes for electrolysis.

Even given the low solubility of magnesium hydroxide? Though I see the appeal of limiting what anions are present. You shouldn't need a very high concentration to have a significant effect, but you can always use sodium hydroxide. Goggles, gloves and a water tap nearby to rinse any splashes off and...
by p1t1o
Thu Apr 20, 2017 2:48 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 1448

Re: Safe electrolytes for electrolysis.

I wasn't sure about SO 2 . I had read somewhere that sulfuric acid was commonly made by oxidizing SO 2 to SO 3 , so I guess I was concerned about that reversing. I'm not concerned about magnesium hydroxide considering it is used as an over the counter antacid. I was even considering using it as a b...
by p1t1o
Thu Apr 20, 2017 8:34 am UTC
Forum: Science
Topic: Aerogel
Replies: 28
Views: 5959

Re: Aerogel

Xanthir wrote:By definition, a subtractive method must leave an open-cell skeleton.


Now that I think about it that does seem obvious.
by p1t1o
Thu Apr 20, 2017 8:32 am UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 1448

Re: Safe electrolytes for electrolysis.

I expect the CO2 would form around the anode. 2H 2 O --> O 2 + 4H + + 4e - So the pH around the anode would drop. What of magnesium sulfate, then? It could release SO 2 or form small amounts of sulfuric acid or magnesium bisulfate I imagine. I think that sulfate is safe, unlikely to strip two oxyge...
by p1t1o
Thu Apr 20, 2017 8:08 am UTC
Forum: Science
Topic: News: Physicists create negative mass
Replies: 6
Views: 1173

Re: News: Physicists create negative mass

Apparently this involves negative effective mass, which is not the literal negative mass of our imaginations. Or something.
by p1t1o
Wed Apr 19, 2017 3:03 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 1448

Re: Safe electrolytes for electrolysis.

You definitely wont get CO by electrolysing bicarb 8-) However, Im not sure if it is a suitable electrolyte, if its electrode potential is too high, it will outcompete the production of hydrogen and you will just get carbonated sodium hydroxide solution. Yes, on checking, bicarbonate is not an *idea...
by p1t1o
Wed Apr 19, 2017 2:46 pm UTC
Forum: Science
Topic: Aerogel
Replies: 28
Views: 5959

Re: Aerogel

Aerogels are generally manufactured in a "subtractive" (correct word?) manner. In that some intermediate product/substance is formed and on exposure/treatment with a solvent, the aerogel "skeleton" is left whilst the substrate is removed. Im not sure if this generally results in ...
by p1t1o
Wed Apr 19, 2017 8:46 am UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 1448

Re: Safe electrolytes for electrolysis.

Himself wrote:So would common batteries in distilled provide enough voltage for distilled water without being painstakingly slow?


Depends on the number and type of battery, naturally. A single 1.5V AA battery will obvs be quite slow, but the reaction should progress.
by p1t1o
Tue Apr 18, 2017 2:07 pm UTC
Forum: Science
Topic: Safe electrolytes for electrolysis.
Replies: 14
Views: 1448

Re: Safe electrolytes for electrolysis.

You can just use distilled water, electrolytes just reduce the energy requirement which for small scale projects, isn't exactly prohibitive. You also want to find some graphite electrodes, if you are using metallic ones, you are likely to get weird "gunge" that is the bain of the amateur e...
by p1t1o
Thu Apr 13, 2017 12:23 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Science-based what-if questions

morriswalters wrote: How do you do cathodic protection of your water heater?


You wouldnt need it!

Zamfir wrote:But typical jewelry gold of 22kt (90% pure) is easily as strong as standard construction steel


No way, is that really true?
by p1t1o
Wed Apr 12, 2017 12:56 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Science-based what-if questions

andykhang wrote:That's why I said the above. You can't install gold lightbulb with gold wiring encasing in gold tube without electrocuting the enitre house (and you in it)


On the other hand, the sound quality of your HiFi would be off the chart!
by p1t1o
Wed Apr 12, 2017 12:17 pm UTC
Forum: Science
Topic: Tongue Cleaning Myth?
Replies: 14
Views: 1719

Re: Tongue Cleaning Myth?

Im not confusing the two, Im comparing the two.

Either way, it stands that a general disdain for dentists or doctors extends only to the places where the healthcare system resembles the one you are exposed to, so I would caution against advising everyone to ignore their advice.
by p1t1o
Wed Apr 12, 2017 8:25 am UTC
Forum: Science
Topic: Storing Nuclear Waste on the Moon
Replies: 57
Views: 5590

Re: Storing Nuclear Waste on the Moon

Rockets are not launched over populated areas, most of them are launched over the ocean. The worst case is godzilla some dead fish, in the incredibly unlikely event that both rocket and spacecraft fail at the same time. See the Falcon 9 explosion for example: The capsule survived an explosion of th...
by p1t1o
Wed Apr 12, 2017 8:04 am UTC
Forum: Science
Topic: Tongue Cleaning Myth?
Replies: 14
Views: 1719

Re: Tongue Cleaning Myth?

Your doctor does not do medical research on you, or perform experiments on his patients. This isn't actually true. It depends on the doctor. I mean, a doctor isn't going to do research on you without your consent, but there are generally various trials happening, at least in a lot of hospitals in t...
by p1t1o
Tue Apr 11, 2017 8:53 am UTC
Forum: Science
Topic: About Sin-gi-jeon
Replies: 3
Views: 1027

Re: About Sin-gi-jeon

There is no arrow that can pierce *all* armour. The best tempered plate armours from italy could resist a level-shot bodkin and an uncontained gunpowder charge isn't going to do much more than disorient a person in full-plate. Gunpowder is not that powerful. Traditional Samurai did not have access t...
by p1t1o
Tue Apr 11, 2017 8:40 am UTC
Forum: Science
Topic: Tongue Cleaning Myth?
Replies: 14
Views: 1719

Re: Tongue Cleaning Myth?

Practicing medicine is not practicing science, so I can believe that there are some striking differences between the most up-to-date research and current medical practices, whether dental or otherwise. But fluoride cannot fill in enamel already lost, so.....there's that. http://www.nytimes.com/2011...
by p1t1o
Tue Apr 11, 2017 8:31 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Science-based what-if questions

A house built out of solid gold has to be built in the shape of a giant Sphinx. Them's the rules.
by p1t1o
Mon Apr 10, 2017 9:08 am UTC
Forum: Science
Topic: Build a small electric shock device
Replies: 12
Views: 12038

Re: Build a small electric shock device

Hi, I want to build a colossal electric shock device, I have 240 yottavolts available between two Reissner–Nordström black holes, in a decaying orbit in my front yard. I'm not sure if I should use ac or do. I would place electrodes on either side of the dipole and connect them to the electric shock...
by p1t1o
Mon Apr 10, 2017 8:14 am UTC
Forum: Science
Topic: Tongue Cleaning Myth?
Replies: 14
Views: 1719

Re: Tongue Cleaning Myth?

I don't understand how that paper is concluding that you should do both. It feels like they meant to evaluate the efficacy of only tongue cleaning, and then concluded that you still need to brush your teeth because tongue cleaning on its own doesn't do much, but they never said as much and seem to ...
by p1t1o
Fri Apr 07, 2017 12:12 pm UTC
Forum: Science
Topic: Build a small electric shock device
Replies: 12
Views: 12038

Re: Build a small electric shock device

Hi,
I'd like to build gigantic electric shock device, I've got several gigatons of particulate matter floating in the upper atmosphere at the moment.
Should I be wearing rubber gloves for this?
by p1t1o
Wed Apr 05, 2017 2:05 pm UTC
Forum: Science
Topic: Why are keratinized skin cell so hard to penetrate?
Replies: 1
Views: 874

Re: Why are keratinized skin cell so hard to penetrate?

I believe it is a physical effect. It is an effective barrier because the filaments are tough and tightly bundled together. A "protein" does not have to be a wet, digestible, nutrient-rich mass. "Protein" just means "made of amino acids" and in some combinations, they c...
by p1t1o
Wed Apr 05, 2017 9:37 am UTC
Forum: Science
Topic: Why haven't any animals evolved wheels?
Replies: 22
Views: 2445

Re: Why haven't any animals evolved wheels?

Rolling locomotion for speed you say?

https://en.wikipedia.org/wiki/Wheel_spider

Not quite sure if it counts as a "wheel" but still...
by p1t1o
Thu Mar 30, 2017 8:56 am UTC
Forum: Science
Topic: Consequences of climate change
Replies: 23
Views: 2734

Re: Consequences of climate change

So what Im hearing is: Changes in food production will cause severe economic problems and there is a significant risk of mass starvations - efforts to solve this will take years and will not prevent initial severe consequences. Changes in habitat will force mass migrations, with accompanying severe ...
by p1t1o
Wed Mar 29, 2017 11:34 am UTC
Forum: Science
Topic: Consequences of climate change
Replies: 23
Views: 2734

Consequences of climate change

Help me out here: I want to be able to state the disadvantages of uncontrolled anthropogenic CO2 production. Im not here to debate whether or not it is happening. There are a LOT of sources saying this will happen, that will happen, this wont happen etc. but I have a hard time judging which ones are...
by p1t1o
Wed Mar 29, 2017 9:49 am UTC
Forum: Science
Topic: Storing Nuclear Waste on the Moon
Replies: 57
Views: 5590

Re: Storing Nuclear Waste on the Moon

I DARE you to name 1 place that does not contribute to the global ecosystem in someway. It may not be obvious and the effects may not be immediate, but doing anything anywhere on this planet affects everything everywhere else. This logic does not quite pan out, since naturally occuring radioactives...
by p1t1o
Tue Mar 28, 2017 8:19 am UTC
Forum: Science
Topic: Is terraforming Uranus and Neptune possible?
Replies: 22
Views: 2416

Re: Is terraforming Uranus and Neptune possible?

gmalivuk wrote:Meh, wake me up when you have as many puns for Neptune.


We could strip Netune's moons for trace elements to help terraform the rocky husk.

Why wouldn't we use a moon belonging to one of the other planets?

Nep-o-tunism.



I tried ok.
by p1t1o
Tue Mar 28, 2017 8:14 am UTC
Forum: Science
Topic: Storing Nuclear Waste on the Moon
Replies: 57
Views: 5590

Re: Storing Nuclear Waste on the Moon

Lets also remember for a second that a significant amount of nuclear waste is produced by coal-fired power stations, and Im not sure about modern power stations or "clean coal" but most of it is ejected into the atmosphere apparently. A 1,000 MW coal-burning power plant could have an uncon...
by p1t1o
Thu Mar 23, 2017 2:08 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Science-based what-if questions

In other words - A 9mm pistol would be useless targeting something on the other side of the world, and so would a relativistic weapon. At some point, putting more energy into your projectile *lowers* effectiveness as a weapon, just as much as if you put 3 pounds of C4 into your 9mm instead of a few ...
by p1t1o
Fri Mar 17, 2017 1:41 pm UTC
Forum: Science
Topic: Eternalism. Does it allow free will?
Replies: 16
Views: 1877

Re: Eternalism. Does it allow free will?

Well there is nothing wrong with tensed verbs, but A-series descriptions are different from the "A-theory of time." Wikipedia does have an article on the B-theory , wherein it attempts to distinguish between the A-theory and presentism: The labels, A-theory and B-theory, are derived from ...
by p1t1o
Thu Mar 16, 2017 4:11 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Planet's spin

Well when I look up today I see nothing, because the angular motion is too slow at night to see the stars move across my field of vision Stand for five minutes and things definitely move, if you stare at the night sky. (I think 8 minutes is enough for the trail end of Orion's Belt to get to where t...
by p1t1o
Thu Mar 16, 2017 12:46 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Planet's spin

Ohhhh... but in that short while, if you stand on it surface, what do you see in the sky (aside from debris and stuff) Well when I look up today I see nothing, because the angular motion is too slow at night to see the stars move across my field of vision, and at day, well it all just blue sky. I p...
by p1t1o
Thu Mar 16, 2017 11:43 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Planet's spin

Yeah, I was talking about that: take the earth current axis, spin it with the force perpendicular to the original spin, then take that new axis and doing the same thing. What would the view be like? And what are you saying earlier suddenly make me thought of a vector weapon... but that landed in SF...
by p1t1o
Thu Mar 16, 2017 9:16 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 317
Views: 24095

Re: Planet's spin

There can be more than one axis of rotation, it just takes an energy input to keep it going - left without external influence, the second axis would gradually disappear, and I presume the angular momentum would transfer to the major axis. The Earth, for example, "precesses" around an axis ...
by p1t1o
Wed Mar 15, 2017 2:42 pm UTC
Forum: Science
Topic: Eternalism. Does it allow free will?
Replies: 16
Views: 1877

Re: Eternalism. Does it allow free will?

Shall we pause for a group viewing of "Arrival"?
by p1t1o
Tue Mar 14, 2017 12:15 pm UTC
Forum: Science
Topic: Free Will
Replies: 161
Views: 8449

Re: Free Will

Im clearly out of my depth here.

*goes away to ponder the nature of existence*

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