baby einstein discovering water play gym
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December 31
Best exercise for endorphins
What's the best type and program of indoor exercise for generating endorphins (and, ideally, continuing to do so for the next couple days)? I have access to a high-end campus gym. Will caffeine increase or decrease the effectiveness, taking into account that it will allow me to work out harder? Also, can I expect a change in endorphin levels to affect my academic performance? NeonMerlin 01:12, 31 December 2008 (UTC)
One way to feel the effect of endorphins is to cry (hear terrible news), then eat a bar of chocolate, then jog for 10 mins. Polypipe Wrangler (talk) 04:05, 3 January 2009 (UTC)
I heard the best types of exercise for endorphins are ones that involve endurance and long periods of time working out such as running, swimming and cross-country skiing.--Apollonius 1236 (talk) 18:12, 3 January 2009 (UTC)
Pressure reducing devices in city water mains
My friend works for the water company in my city, and she was telling me about these large machines that they have at certain locations along the water mains pipelines, which reduce the pressure. So, as she says, water enters it at one pressure (she measures pressure in feet) and exits it at a lower pressure. She couldn't explain how it worked, unfortunately, which was frustrating because I can't understand how such a device could possibly work. Wouldn't some other property of the water also have to be changed, as all the various properties are tied together by Bernoulli's law and other such fluid mechanics principles? Cheers, Maelin 01:42, 31 December 2008 (UTC)
Laser based short sight correction-what is the downside?
This question has been removed. Per the reference desk guidelines, the reference desk is not an appropriate place to request medical, legal or other professional advice, including any kind of medical diagnosis, prognosis, or treatment recommendations. For such advice, please see a qualified professional.This question has been removed. Per the reference desk guidelines, the reference desk is not an appropriate place to request medical, legal or other professional advice, including any kind of medical diagnosis or prognosis, or treatment recommendations. For such advice, please see a qualified professional. --~~~~Reactivity of Salt
Reactivity of Sodium formate and calcium chloride salt towards water?
Time
What is used as the physical point of reference for the time of day? Is it the orientation of the sun and the earth? In other words, if all of the clocks in the world stopped, would they be reset by (for example) saying that it is 12pm GMT when the Greenwich Meridian is directly in line with the sun (i.e. the sun is highest in the sky over the Meridian)? YaniMani (talk) 11:30, 31 December 2008 (UTC)
When the sun is directly over the Prime Meridian, that should be the setpoint, conceptually, for all clocks, as it in fact was in the late 19th and early 20th century, before other standards such as atomic clocks. I understand that for reasons perhaps having to do with the sensitivities of the French to British standards, or the earth not being perfectly symmetrical, the GPS system places 0 degrees longitude a short distance away from the engraved line in a brass plate which equals the center line of the telescope at Greenwich formerly used for the determination of time. So the sun being directly overhead of one of the historic prime meridians could be used as the synchronizing standard of clocks. Edison (talk) 19:14, 31 December 2008 (UTC)
To answer your question as asked: The definition of time has two components: the length of the second, and a nominal zero point. The current defintion for the duration of a second is no longer related in any way to the movement of the earth or other celestial bodies. The starting point is related to a particular event (actually, a statistical average of multiple events) in the past. Therefore, for purposes of definition, the answer to your question is "no." There is no formal definition of a particular future celestial event as being at a defined time. All future celestial events will have observed times, not defined times. Now to answer your hypothetical question: If by horrible mischance, we somehow lose track of time, How would we reset the clocks? This affects only the zero point, not the length of the second: we can create new clocks that accurately measure the length of the second. This means the new zero point must be agreed upon by convention. Depending on how long the clocks were stopped, teg new agreement might try to relate "new time" to "old time" by picking a particular celestial event that was predicted to high precision with respect to "old time" and agreeing that the event is the reference pont for "new time." But note that this would be a new agreement made by a comitee, and would have no more (or less0 absolute signigicance than our current definition. -Arch dude (talk)
January 1
Date
What year is it? ~ R.T.G 12:42, 1 January 2009 (UTC)
No time machine available in this age, sorry. This is year 2009; you better live with it... What year were you coming from?--PMajer (talk) 13:42, 1 January 2009 (UTC)
An optional use for leeches?
A was looking at some stupid stars advocating leeches as detoxifier (pfff). Anywayit got me mind rolling in a sort of similar direction, could those blood sucking MOFOs be used in conjunction with a diet? I would imagine that there are strick homeostatic processes that keep the volume of blood and number of cells constant, so if blood was removed energy would need to be dissipated to restore balance. Does this theoretically make sense?78.133.19.131 (talk) 13:00, 1 January 2009 (UTC)
This rings my bullshit detector Wiki Cheng Bastard Soap (talk) 11:23, 2 January 2009 (UTC)
I know someone who contracted giardiasis, then deliberately didn't get treated, to assist with dieting. I've heard of people use a similar trick with tapeworms. Medical advice: I wouldn't recommend any of these methods. Axl ¤ 09:59, 3 January 2009 (UTC)
do the congenitally blind understand literary descriptions?
There are some things I read, for example colors I don't know the names of, even vaguely (Carmine? Puce? Bimini?), where I don't know what they're talking abut. But do the congenitally blind understand most visual descriptions? Do they know the same thing everyone else does, like what a mirror is, etc, or are these things like these weird colors are for me? —Preceding unsigned comment added by 79.122.79.41 (talk) 21:31, 1 January 2009 (UTC)
Also just as a note - A lot of blind people aren't walking around in total darkness (i.e. seeing nothing), but rather there are a wide degrees of what the blind can 'see' (changes in light, silhouettes etc.) - it really depends on the individual. 194.221.133.226 (talk) 10:36, 2 January 2009 (UTC)
Mechanical device that keeps something spinning in exactly the right speed
Here's something I've been wondering since I was a wee lad (well, teenager, at least). I've asked a number of people this over the years (though obviously no engineer), but never gotten the answer. I've finally decided to find out the answer, once and for all, with the help of you fine refdeskers.
An old-timey mechanical wind-up clock works on this principle: you wind up a spring until there's lots and lots of tension in that spring. That tension is slowly released to the various cogs and gears inside the clock, and finally transmitted to the dials on the face of the clock. But here's my question: the spring can be wound with various degrees of tension, but the clock still goes at the same rate. If you wind the spring to half its capacity, the gears in the clock should only go at half the speed as if the spring was wound to full capacity (this is Hooke's law, no?) And yet, the dials on the face always moves at constant speed, regarless of how much tension there is in the spring. There must be some mechanical device doing this.
The reason I keep wondering about this is that there's all sorts of machines that seems to be using this same device, and whenever I see them, I wonder once more. Old movie cameras, for instance, were powered by springs or a hand-crank, yet regardless of how much tension there is in the spring or how fast you rotate the crank, the camera has to rotate the shutter and feed the
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