# dstebbins

Senior Members

412

...
2. ## Why does mankind crave violence so much?

Most people who commit acts of violence without motivation are merely seeking a thrill, aka an adrenaline rush. But why does adrenaline feel good, when it's designed to get us out of danger, not make us want to put ourselves in danger?

4. ## Expansion of spacetime.

Ok, let me try and get this straight. In Stephen Hawking's "A Brief History of Time," he mentions one theory that the reason the universe is expanding and not collapsing is because, after a while, the force of gravity stops being one of attraction and starts being one of repulsion. So, are you suggesting that, since gravity decreases and increases exponentially with distance, that, after a while, the force of gravity will become so weak that it is overpowered by the expansion forces, which increase linearly with distance? Is that the gist of it?
5. ## Expansion of spacetime.

The diameter of the known universe is about 89 billion light years. That's about 44.5 billion light years in radius. However, the universe is only about 13 billion years old. This seems to negate the law that the speed of light can never be reached or exceeded, which means that the universe should be less than 13 billion light years in radius, not 44.5 billion. Scientists (notably, Albert Einstein and his Theory of Relativity) have supposedly solved this dilemna by suggesting that the universe (not the matter and energy inside it, but spacetime itself) is expanding, and the rate at which it expands has no intrinsic limit. This essentially means that the universe is expanding at over twice the rate of which the matter and energy inside it is moving apart from each other. But if this is the case, how come we can't see this with the naked eye? If this is true, then, if I leave my TV and DVD player alone, to gather dust, for a year, the two should be significantly further apart after said year than they were at the beginning, yet they are always in the same location relative to each other unless I actually MOVE one of them! The same goes for my keyboard and monitor, or my car and my garage. Sure, the universe is expanding at an astronomical level, but by scale, this seems to be something we should be able to detect with the naked senses in a manner I just described. So, why isn't it?
6. ## The Big Bang and parallel universes

It is now considered by physicists that other universes besides our own could exist in a grand multiverse. One thing led to another, and scientists have hypothesized that universes can be created by collisions of the membranes of other universes, causing explosions, which, ultimately, means that we can, one day, create custom universes in a lab, and that custom universe will, in pectoseconds, seperate itself from our universe. It will grow to astronomical sizes, but never take up any space or time in our universe. However, the Big Bang is "big" relevant to what? Of course it's relevent to us, but that rhetorical question was designed to lead to this statement: Anything can be considered "big," as long as the reference point is small enough. If you step on a roach, I'm pretty sure tha roach doesn't consider itself small; it considers you big. This is the same with humans and African elephants. We consider them big, because bigger than us, but they probably consider us very very small. As long as the reference point is small enough, a simple clap on the hands could be considered a "big bang." A mere party-popper can sound like a gunshot from God, if your small enough to think so. Could it be possible that we are creating universes all the time? Clap, and you've caused a Big Bang, and a new universe is created and seperates itself from our universe faster than the eye can see. Stomp your foot, and you've done it again? Hey, weirder stuff has happened in physics before (like parallel universes in the first place), so let's keep an open mind. What do you think?
7. ## How do sleeping pills work?

I'm a big fan of Equate Pain Reliever PMs (that's basically a cheaper equivalent to Tylenol PM; it helps me sleep), but on a chemical scale, how do these drugs work? Is it that they require so much energy to break down and digest that the loss of energy is what leaves you sleepy? How do they work?
8. ## GPS assistance with lost persons.

Except my manhood. Well, I hope this inventor has considered this kind of thing.
9. ## GPS assistance with lost persons.

I'm about to take a vacation to another country, and I'm worried about getting mugged and robbed. I've been hearing recently about a rather new piece of technology that is designed for just this sort of thing. It's called the Technobra, and it notices a jolt in your heart rate and uses GPS and wi-fi technology to alert the authorities of your name and location, so that they can find you anywhere in the world. The problem is: I'm a guy. Is there any kind of this technology that I can use on my vacation?

11. ## balancing the "computer specs" equation.

I want the scale. For example, for every kB of RAM I have, how many MHz of CPU speed would I need to have no "limiting reagents?" And, for every MHz of CPU, how much cache would the CPU need?

13. ## The reasons for jet lag.

Isreal? Were you in the army?
14. ## The reasons for jet lag.

Why is it that we always feel groggy after we take a flight to another time zone, most commonly known as "jet lag?" I mean, if I'm in Los Angelas, and I take a four-hour flight to the Bahamas, which is four time zones ahead of LA, then the time should only increase by eight hours, meaning if my plane takes off at 9am, it should only be 5pm. So, why is that, despite the fact that I'm spending 8 hours playing my DS and text messaging on my phone, I still feel as tired and groggy as if I had spent 8 hours in a factory? EDIT: Btw, I've never been on a plane before in my life, so if I'm confused about something I wouldn't be if I had ever flown before, forgive me.
15. ## How many miles to the gallon are we talking, here?

Sorry, bro. I don't exactly swing on that side of the plate. Besides, even if I did like dudes, I'm not single, so... yeah. How's that for being a prick?
16. ## How many miles to the gallon are we talking, here?

I thought this was a science forum; can't you predict anything? Like, can't you give me some kind of hypothesis? Like, here's my logic for why the bike should give me at least 120mpg. My current car has 20mpg, and it weighs 2725lb. Combined with my body weight and the junk I have in the passenger seat, it comes to about 3000lb. 192lb for this bike, and 240lb for my body weight, coupled with about 20lb for a backpack carrying either a week's supply of groceries (about 2lb per day, or 14lb per week) or my textbooks for college (about 10lb total, plus about 5lb for the backpack itself) brings me to about 451lb, so it's less than a sixth of the weight of my current car, so I can expect at least six times the fuel efficiency. Not only that, but a motorcycle has less parts banging against each other, which means less friction, so the fuel efficiency should go even higher. Would you agree with my logic?
17. ## How many miles to the gallon are we talking, here?

I've been thinking about switching to a motorcycle because of the fact that they're so much cheaper (both to buy and to maintain) than cars. Well, I've found a nice one here. http://www.hondaofrussellville.com/new_vehicle_detail.asp?sid=03165247X7K11K2009J9I15I55JAMQ2743R0&veh=3424&pov=1184862 I know it doesn't exactly look "macho," but that's the last thing on my mind. Judging from those specs, what do you estimate the fuel efficiency for a 240lb driver would be?
18. ## How do I figure this out?

You've obviously never watched a randomized Youtube playlist. I often do that with playlists from Whose Line is it Anyway, watching games like Hoedown and Scenes from a Hat. Often, I think to myself "Wait, didn't I just watch this one?"
19. ## How do I figure this out?

I don't think you understand the problem. See, when you click "randomize" on a Youtube playlist, whenever it's done with one video, it goes to a different random one, but after that one, it could go to any video in the playlist other than the one it just finished. You could, theoretically, end up watching the same two videos over and over again, if randomness decides so. Let me try a different situation. Suppose you have a sack full of twenty numbered balls, with the numbers 1 through 20 on them. You pull out one ball and record its number. If you pull out the #1 ball, you check the box that says "success?" and draw another ball, but immediately after you draw the second ball (and this is very important), you put the ball from Stage 1 back into the sack. Stages 3 through 20 are the same as stage 2 (draw another ball and discard the previous ball immediately afterwards), so all the stages except 1 have a 1 in 19 chance. So, in that case, would my chances of it being in perfect numerical order be (1/20)*(1/19)^19?
20. ## How do I figure this out?

Well, needless to say, the probability that the first one in the playlist is the earliest is one in x. So, I guess, if that were the case (the one in x chance happened), then y would be returned 1. If it didn't happen, then y would return 0. I can figure that, no problem, but that would only work if every trial was independent of every other trial. I can also figure out (with relative ease) the odds of inter-dependent trials like card-counting at the casinos, but this is sort of a mixture between the two. How would I figure the probability that all the y's would return 1, and not one y would return 0? Merged post follows: Consecutive posts mergedWait, something just came to me. Let's pretend that there are 20 videos in the playlist. If the first one (chosen completely at random) is video 1, then that's a one in twenty chance of y = 1. If y = 1 the first time, then the chances of y = 1 the second time would be one twentieth of the original chance, or one in four hundred. Therefore, the chance that we'd have twenty y = 1 would be one in 20^20, or 1.048576e+026 (copied and pasted from my Graph Calc program). Is that the jist of it?
21. ## How do I figure this out?

Well, I just took this course as an elective, and I don't have to answer this particular problem; it's just designed to give me an idea of what I'm getting myself into if I don't drop the class. My question is, am I panicking over nothing? How is this problem worked, and I can decide for myself if I'm ready for this class.
22. ## How do I figure this out?

I'm taking a summer semester right now, with a REALLY tough math class. Here's an example of the kind of stuff I've got. Your watching a movie on a Youtube playlist with x videos. On the first video, you click the random button and click "play next" once to take you away from the first video, and click "play next" a second time to take you to another video that could be any one of the x number of videos, including the first one. After that, you watch x videos in a row without touching the keyboard or mouse. What are the odds that the entire movie will be played in perfect chronological order? Needless to say, my instructor is a big computer nerd. This is the first week of the class (block 2 of Summer Semester), and he wanted to give us a taste, so if we didn't know beforehand what we were getting ourselves into, it's best if we drop the class if it's not needed for our degrees (which, for me, it's not). Is this problem easier to solve than I think it is, or should I drop? HELP!
23. ## animal instinct

Playing the video game Assassin's Creed made me wonder this. Hybernation, reproduction, all those things that are attributed to "animal instinct," things that the animals somehow know, absent the requisite first-hand experience (also, if these things are "instinct," then how come humans, who are just as much animals as dogs and cats, have to be taught how to reproduce or sleep and eat?). I don't doubt for one minute that "instinct" is what the phenomenon is called, but what causes instinct? The guy in Assassin's Creed explained this the way most people explain it: Instinct exists because it just does. But, for scientists, since when was "just because" a suitable answer? Honestly, has there ever even been any research on this, much less conclusive results? If there is, how come I haven't seen it. Such an unexplained phenomenon finally being explored should be front page material.
24. ## Creating a robocop

How am I like a Nazi? Hitler wanted to make new crimes; notably, he wanted to simply making the state of being a Jew a crime. I'm merely suggesting we increase the punishments for already established crimes. There IS a difference.
25. ## Creating a robocop

Okay, can you try using proper English?
×