Search found 1255 matches

by davidstarlingm
Wed Dec 11, 2013 2:38 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

Hmm. It may be that I'm seeing where the lines cross and assuming it means they're focusing, when it's really more like a scattering effect. Just because they are crossing in a symmetric fashion doesn't mean they're being focused at all. Within a certain radius, all light is absorbed. Within a sligh...
by davidstarlingm
Tue Dec 10, 2013 10:49 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

Found this lovely bit. Apparently someone has done some extensive work on this already. http://nho.ohn.free.fr/celestia/Cham/Divers/bending.jpg You can see how the photosphere is formed well outside the actual event horizon. So I'm not sure it ever diverges on the right-hand side. A focusing effect ...
by davidstarlingm
Tue Dec 10, 2013 8:37 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

So I'm guessing θ is given in radians? The page says it can be simplified to 2r s /r, where r s is the Schwarzchild radius. But what is r? Is that the nearest approach made by the photon to the black hole? The shortest distance between the undeflected trajectory and the black hole? Without digging ...
by davidstarlingm
Tue Dec 10, 2013 7:24 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

Better correct your open quote there. So I'm guessing θ is given in radians? The page says it can be simplified to 2r s /r, where r s is the Schwarzchild radius. But what is r? Is that the nearest approach made by the photon to the black hole? The shortest distance between the undeflected trajectory...
by davidstarlingm
Tue Dec 10, 2013 7:17 pm UTC
Forum: What If?
Topic: What-If 0075: "Phone Keypad"
Replies: 69
Views: 40174

Re: What-If 0075: "Phone Keypad"

capefeather wrote:Yeah, am I weird for using my left hand for b, or is Randall weird for using his right?

I use my left index finger for b as well.

(had to type a sentence containing the word "because" in order to figure it out)
by davidstarlingm
Tue Dec 10, 2013 7:13 pm UTC
Forum: Serious Business
Topic: Age-based Minimum Wage
Replies: 23
Views: 11093

Re: Age-based Minimum Wage

Maybe we need a way to incentivize entry-level salaried positions. Can we substantially lower payroll taxes on salaried positions? This would make employers want to be able to provide stable full-time jobs to any employees who actually need them. How would you legislate what constitutes 'entry-leve...
by davidstarlingm
Tue Dec 10, 2013 5:56 pm UTC
Forum: What If?
Topic: What-If 0075: "Phone Keypad"
Replies: 69
Views: 40174

Re: What-If 0075: "Phone Keypad"

Several of the passwords I used in the past were (unintentionally) all or almost-all typable with just one hand. Which was convenient.
by davidstarlingm
Tue Dec 10, 2013 5:19 pm UTC
Forum: What If?
Topic: What-If 0075: "Phone Keypad"
Replies: 69
Views: 40174

Re: What-If 0075: "Phone Keypad"

Yeah, I got broken image links as well. Thought it was just my office firewall -- it's wonky sometimes.
by davidstarlingm
Tue Dec 10, 2013 4:46 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

Let's see. Anything that makes it through is clearly going to be a hyperbolic orbit, which can be characterized on the basis of its asymptotic deflection angle θ: http://s24.postimg.org/mx9i3ksgl/deflection_angle.png For a given black hole mass and distance from the primary, the deflection angle for...
by davidstarlingm
Tue Dec 10, 2013 4:00 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

We ought to collapse it to the one-dimensional case; we won't see the focusing effect so clearly, but it can give us a better idea of what the possible curves might look like. After all, that's what we want to know -- where are the minimums and maximums and relative heights of the curves along that ...
by davidstarlingm
Tue Dec 10, 2013 2:27 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

What are the characteristics of a photon's orbit around a black hole? Is it necessarily parabolic? Hyperbolic? I'm thinking that perhaps there is no safe point immediately behind the black hole at all. And it's possible that even if the focusing diverges, it's always stronger than the background inv...
by davidstarlingm
Tue Dec 10, 2013 2:14 pm UTC
Forum: Fictional Science
Topic: Mars Cycler diverted from course
Replies: 1
Views: 2839

Re: Mars Cycler diverted from course

Hey folks, I am writing a SciFi story about an Earth-Mars Cycler that is diverted from course on its way to Mars. The story will likely be that a mad crew member will take over the cyclers controls and set a collision course with Mars. The ships thrusters will not be available for some time until t...
by davidstarlingm
Mon Dec 09, 2013 10:50 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

This is still a mathless version, but one which was made with a slightly greater amount of care.... You know, it might actually be better to be anywhere on the opposite side from the black hole. http://s29.postimg.org/98bfreuav/raytrace2.png I would predict that the radiation you get hit with increa...
by davidstarlingm
Mon Dec 09, 2013 10:27 pm UTC
Forum: Serious Business
Topic: Age-based Minimum Wage
Replies: 23
Views: 11093

Re: Age-based Minimum Wage

If I have a position opening that's worth about $9 an hour to me(which I likely will in march), it's very easy for me to currently find someone for that. How on earth am I going to hire someone I might have to pay $7.50, or might have to pay $14.50? In the latter case, I'm bleeding cash. Obviously,...
by davidstarlingm
Mon Dec 09, 2013 10:22 pm UTC
Forum: Science
Topic: Obtaining an image without developing the film
Replies: 8
Views: 3276

Re: Obtaining an image without developing the film

I'm having a discussion with a some photographers/artist friend. They argue that the latent image on a traditional silver halide film does not exist before the film is developed, because according to them there is no way we can detect the image other than developing it. Philosophical aspects aside,...
by davidstarlingm
Mon Dec 09, 2013 9:12 pm UTC
Forum: Serious Business
Topic: Age-based Minimum Wage
Replies: 23
Views: 11093

Re: Age-based Minimum Wage

I'm alright with your suggestion of incentives for entry-level salary positions, but that seems to only benefit those who want the full time position, and might only be offered to those who show potential for advancement. It doesn't offer much benefit to those who want to stay part-time or don't ha...
by davidstarlingm
Mon Dec 09, 2013 9:02 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

I don't know how "so sure" is, but I did not mean to suggest that there's perfect shade anywhere, just that it has to create relative shade for some volumes somewhere in order to concentrate radiation anywhere else- which sounds kinda dumb when I put it that way, but... uh, yeah. :oops: N...
by davidstarlingm
Mon Dec 09, 2013 8:12 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1301: "File Extensions"
Replies: 102
Views: 33069

Re: 1301: "File Extensions"

da Doctah wrote:Limiting ourselves to the realm of "words and a bit of very basic formatting", where does .rtf fall on this scale?

I tend to see RTFs which follow in the footsteps of .net black-background webpages.
by davidstarlingm
Mon Dec 09, 2013 7:03 pm UTC
Forum: News & Articles
Topic: Police misbehavior thread
Replies: 7003
Views: 1159291

Re: Police misbehavior thread

My initial reading of it looks like it may have been reasonable. Disabling the vehicle may have been safer for the kids than letting her continue to drive recklessly. Vans do not handle well at high speeds. If she was going 100mph+ in the van with kids inside, that's pretty bad. "I wasn't runn...
by davidstarlingm
Mon Dec 09, 2013 6:19 pm UTC
Forum: News & Articles
Topic: Police misbehavior thread
Replies: 7003
Views: 1159291

Re: Police misbehavior thread

Here's an interesting one....

Officer fires at van full of children

He said he was just shooting at the tires to try and immobilize the vehicle, which had been racing through crowded residential areas at 100+ mph. Justifiable?
by davidstarlingm
Mon Dec 09, 2013 6:08 pm UTC
Forum: News & Articles
Topic: Couple Found Guilty of Murder, followed parenting book
Replies: 219
Views: 30206

Re: Couple Found Guilty of Murder, followed parenting book

Saying that there is no way that this book can improve society therefore it can't be sold, doesn't limit free speech. Would this apply to Mein Kampf ? To The Anarachist Cookbook ? To the Bible itself? Because we'd have to all agree on which books fit into this category, and I don't think agreement ...
by davidstarlingm
Mon Dec 09, 2013 5:36 pm UTC
Forum: Serious Business
Topic: Age-based Minimum Wage
Replies: 23
Views: 11093

Re: Age-based Minimum Wage

Granted, this is what they do in Australia, and it seems to work well enough there. Perhaps implementing the same thing here would have a similar effect, given enough time. But I'm sure studies can be done on that. I've heard that in Australia, the lower cost of younger workers means that older wor...
by davidstarlingm
Mon Dec 09, 2013 5:12 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

Wouldn't there be a gradient behind the black hole, where one region had much-more-concentrated radiation and the region behind it had much-less-concentrated radiation? Something like this, perhaps:

Image
by davidstarlingm
Mon Dec 09, 2013 4:35 pm UTC
Forum: Serious Business
Topic: Age-based Minimum Wage
Replies: 23
Views: 11093

Re: Age-based Minimum Wage

Hm... or it could be spending money kids cheaper and supporters more expensive, but businesses could be offered a tax cut equal to the difference between supporters and non-supporters as an incentive not to turn away supporters. Or, like I said, a payroll tax cut on full-time entry-level salaried p...
by davidstarlingm
Mon Dec 09, 2013 4:34 pm UTC
Forum: News & Articles
Topic: SeaTac, Washington State Passes $15 Minimum Wage
Replies: 239
Views: 37837

Re: SeaTac, Washington State Passes $15 Minimum Wage

Has anyone checked out the age-based minimum wage thread over on SB? Or my suggestion to reduce payroll taxes on entry-level salaried positions, thus providing an incentive for companies to put breadwinner employees on a livable weekly salary? I'm not sure if I buy such nebulous terms as livable wa...
by davidstarlingm
Sun Dec 08, 2013 2:02 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

gmalivuk wrote:Radiation from more angles doesn't mean more radiation, though.

I'm sure it wouldn't be too hard to do some ray-tracing and come up with an equation to predict the amount of incident radiation for any spacing/BH size.
by davidstarlingm
Sun Dec 08, 2013 2:42 am UTC
Forum: News & Articles
Topic: SeaTac, Washington State Passes $15 Minimum Wage
Replies: 239
Views: 37837

Re: SeaTac, Washington State Passes $15 Minimum Wage

Has anyone checked out the age-based minimum wage thread over on SB? Or my suggestion to reduce payroll taxes on entry-level salaried positions, thus providing an incentive for companies to put breadwinner employees on a livable weekly salary?
by davidstarlingm
Fri Dec 06, 2013 10:24 pm UTC
Forum: Serious Business
Topic: Age-based Minimum Wage
Replies: 23
Views: 11093

Re: Age-based Minimum Wage

The problem with an age-based minimum wage is that it does absolutely nothing to distinguish between younger workers who are just working part-time for spending money and younger workers who are actually having to help support their families (their kids, or their disabled parents, or their siblings)...
by davidstarlingm
Fri Dec 06, 2013 7:14 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

A black hole would make a good shield for neutrinos. A neutron star might work too. No. Placing a black hole between you and a supernova would actually make it worse. Think about how the area outside of the photon sphere will bend radiation and hot particles. **immediately begins fantasizing about ...
by davidstarlingm
Fri Dec 06, 2013 6:42 pm UTC
Forum: News & Articles
Topic: Couple Found Guilty of Murder, followed parenting book
Replies: 219
Views: 30206

Re: Couple Found Guilty of Murder, followed parenting book

When we ban ideas, we give them power. We legitimize them. We say, "We are afraid of that idea. It is a strong idea and we cannot defeat it without the use of force." An idea which is banned has more value than an idea which is not banned. We are not afraid of Michael Pearl's ideas. They ...
by davidstarlingm
Fri Dec 06, 2013 6:24 pm UTC
Forum: News & Articles
Topic: Daily Dose of Fundamentalism
Replies: 81
Views: 11851

Re: Daily Dose of Fundamentalism

addams wrote:With all those friends from Christain Life you posted about knowing?
In what way is having tons of friends that are all being abused isolating?

Because we were all brainwashed into thinking it was normal and right.
by davidstarlingm
Fri Dec 06, 2013 6:04 pm UTC
Forum: News & Articles
Topic: Medical radioactive waste stolen in Mexico
Replies: 45
Views: 8202

Re: Medical radioactive waste stolen in Mexico

Honestly, probably better off not sweating super permanent, strange markings, and just burying it deep. If you don't mark it special, sure, someone *might* stumble onto it, but if it's hard to get to, and doesn't seem special, it's pretty unlikely. There are a *lot* of places on earth we haven't du...
by davidstarlingm
Fri Dec 06, 2013 5:36 pm UTC
Forum: News & Articles
Topic: Medical radioactive waste stolen in Mexico
Replies: 45
Views: 8202

Re: Medical radioactive waste stolen in Mexico

@davidstarlingm We already know the answer to that question. Marie Curie. And if we lose the capacity and knowledge of materials that we developed over the last 300 years getting dosed at whatever level will be the least of our problems. With no easily obtainable fossil fuels left to drive civiliza...
by davidstarlingm
Fri Dec 06, 2013 5:34 pm UTC
Forum: News & Articles
Topic: Bam goes the lid -- rebels from the homeschooling movement
Replies: 26
Views: 4883

Re: Bam goes the lid -- rebels from the homeschooling moveme

The homeschooling and religious aspect of this abuse is important though. It plays a central role in the manifestation of this particular kind of abuse, and talking about this without that context devalues the experiences of those who survived it while simultaneously ignoring a crucial element to t...
by davidstarlingm
Fri Dec 06, 2013 5:05 pm UTC
Forum: Mathematics
Topic: Puzzle on Survivor
Replies: 7
Views: 3229

Re: Puzzle on Survivor

These cubes were about half a meter across, making things a little trickier. There was a lazy-susan-style rack in which they were stacked which rotated freely, though. I wasn't thinking of building the stack "on its side" but of having all four cubes arranged on the ground such that the ax...
by davidstarlingm
Fri Dec 06, 2013 4:48 pm UTC
Forum: News & Articles
Topic: Medical radioactive waste stolen in Mexico
Replies: 45
Views: 8202

Re: Medical radioactive waste stolen in Mexico

High-level waste disposal schemes typically involve something like metal cannisters filled with ceramic waste, the cannisters cast in concrete, buried far below the surface. It's not as if it's easy to release the stuff. Especially if those hypothetical future people don't have power tools. Turn ba...
by davidstarlingm
Fri Dec 06, 2013 4:44 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 132
Views: 74131

Re: What-If 0073: "Lethal Neutrinos"

A black hole would make a good shield for neutrinos. A neutron star might work too. No. Placing a black hole between you and a supernova would actually make it worse. Think about how the area outside of the photon sphere will bend radiation and hot particles. **immediately begins fantasizing about ...
by davidstarlingm
Fri Dec 06, 2013 3:50 pm UTC
Forum: Mathematics
Topic: Puzzle on Survivor
Replies: 7
Views: 3229

Re: Puzzle on Survivor

Crap, 24 is a lot more than 6. I always underestimate brute-force solutions somehow. Can you give a breakdown of the graph approach here, just for curiosity's sake? My network is blocking your site. Would you be able to implement that approach if you were solving the puzzle on the show IRL? My intui...
by davidstarlingm
Fri Dec 06, 2013 3:46 pm UTC
Forum: News & Articles
Topic: Medical radioactive waste stolen in Mexico
Replies: 45
Views: 8202

Re: Medical radioactive waste stolen in Mexico

Izawwlgood wrote:And assuming no one assumes it can be used as a weapon.

You mean, assuming no one figures out it can be used as a weapon.
by davidstarlingm
Fri Dec 06, 2013 3:36 pm UTC
Forum: News & Articles
Topic: NSA tracking cell phone locations
Replies: 98
Views: 14736

Re: NSA tracking cell phone locations

Anyone who was surprised by this, raise your hand. Anyone with a hand raised, follow me. I have some snow in Alaska you might be interested in. Every time one of these releases comes out someone says this... Who cares if anyone is surprised, why even bring it up? It takes away from the confirmation...

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