White light from the sun hits the atmoshpere at a tangent angle, acting like a prism. The part visible at our angle is sometimes blue. Atmospheric condition(like humidity) can make it red, or even green.
The sky appears blue (instead of black) because light passing through the air hits tiny particles like dust and pollen. These tiny particles are large enough to reflect blue light, but red light (which has a longer wavelength) is not reflected nearly as much. So the result is that the blue light gets scattered by the particles, and you see it when you look up.
Originally posted by mattm Great information. You guys really impress me.
Now he asks why crap is brown?? This is for real. He's bugging the **** out of me.
> Oldie but a goodie!!
>> HOW TO POOP AT WORK
>> We've all been there but don't like to admit it. We've
> all kicked back
>> in our cubicles and suddenly felt something brewing
> down below. As
>> much as we try to convince ourselves otherwise, the
> WORK POOP is
>> inevitable. For those who hate pooping at work,
> following the Survival
>> Guide for taking a dump at work:
>> CROP DUSTING:
>> When farting, you walk really fast around the office so
> the smell is
>> not in your area and everyone gets a whiff but doesn't
> know where it
>> came from. Be careful when you do this. Do not stop
> until the full
>> fart has been expelled. Walk an extra 30 feet to make
> sure the smell has
>> left your pants.
>> FLY BY:
>> The act of scouting out a bathroom before pooping. Walk
> in and check
>> for other poopers. If there are others in the bathroom,
> leave and come
>> back again. Be careful not to become a FREQUENT FLYER.
> People may
>> become suspicious if the catch you constantly going to
> the bathroom.
>> A fart that slips out while taking a leak at the urinal
> or forcing a
>> poop in a stall. This usually is accompanied by a
> sudden wave of
>> embarrassment. If you release an escapee, do not
> acknowledge it.
>> Pretend it did not happen. If you are standing next to
> the farter,
>> pretend you did not her it. No one likes an escapee. It
>> ncomfortable for all involved. Making a joke or
> laughing makes both
>> parties feel uneasy.
>> When forcing a poop, several farts slip out at a
> machine gun pace. This
>> is usually a side effect of diarrhea or a hangover. IF
> this should
>> happen, do not panic. Remain in the stall until
> everyone has left the
>> bathroom to spare everyone the awkwardness of what just
>> COURTESY FLUSH:
>> The act of flushing the toilet in the instant the poop
> hits the
>> water.This reduces the amount of air time the poop has
> to stink up the
>> bathroom. This can help you avoid being caught doing
> the WALK OF SHAME.
>> WALK OF SHAME:
>> Walking from the stall, to the sink, to the door after
> you have just
>> stunk up the bathroom. This can be a very uncomfortable
> moment if
>> someone walks in and busts you. As with farts, it is
> best to pretend
>> that the smell does not exist. Can be avoided with the
> use of the
>> COURTESY FLUSH.
>> OUT OF THE CLOSET POOPER:
>> A colleague who poops at work and is damn proud of it.
> You will often
>> see an OUT OF THE CLOSET POOPER enter the bathroom with
> a newspaper or
>> a magazine under their arm. Always look around the
> office for the OUT
>> OF THE CLOSET POOPER before entering the bathroom.
>> THE POOPING FRIENDS NETWORK (P.F.N.):
>> A group of co-workers who band together to ensure
> emergency pooping
>> goes off without incident. This group can help you
> monitor the
>> whereabouts of Out of The Closet Poopers, and identify
> SAFE HAVENS.
>> SAFE HAVENS:
>> A seldom used bathroom somewhere in the building where
> you can least
>> expect visitors. Try floors that are predominantly of
> the opposite
>> sex. This will reduce the odds of a pooper of your sex
> entering the
>> TURD BURGLAR:
>> Someone who does not realize that you are in the stall
> and tries to
>> force the door open. This is one of the most shocking
> and vulnerable
>> moments that can occur when taking a poop at work. If
> this occurs,
>> remain in the stall until the TURD BURGLAR leaves. This
> way you will
>> avoid all uncomfortable eye contact.
>> Phony cough that alerts all new entrants into the
> bathroom that you are
>> in the stall. This can be used to cover up a
> WATERMELON, or to alert
>> potential TURD BURGLARS. Very effective when used in
> conjunction with
>> an ASTAIRE.
>> A subtle toe-tap that is used to alert potential TURD
> BURGLARS that you
>> are occupying a stall. This will remove all doubt that
> the stall s
>> occupied. If you hear an ASTAIRE, leave the bathroom
> immediately so the
>> pooper can poop in peace.
>> A poop that creates a loud splash when hitting the
> toilet water. This
>> isalso an embarrassing incident. If you feel a
> WATERMELON coming
>> on,createa diversion. SEE CAMO-COUGH.
>> A case of diarrhea that creates a series of loud
> splashes in the toilet
>> water. Often accompanied by an ESCAPEE. Try usinga
> CAMO-COUGH with an
>> UNCLE TED:
>> A bathroom user who seems to linger around forever.
> Could spend
>> extended lengths of time in front of he mirror or
> sitting on the pot.
>> An UNCLE TED makes it difficult to relax while on the
> crapper, as you
>> should always wait to poop when the bathroom is empty.
> This benefits
>> you as well as the other bathroom attendees.
Why is poop brown?
The color comes mainly from bilirubin, a pigment that arises from the breakdown of red blood cells in the liver and bone marrow. The actual metabolic pathway of bilirubin and its byproducts in the body is very complicated, so we will simply say that a lot of it ends up in the intestine, where it is further modified by bacterial action. But the color itself comes from iron. Iron in hemoglobin in red blood cells gives blood its red color, and iron in the waste product bilirubin gives rise to its brown color.
A friend of mine just sent me the link to your website for fun. I really enjoyed the ‘Survival Guide for Taking a Dump at Work’. However, I believe that there is an error among your explanation for the color of feces. The brown color is a result of broken down red blood cells, but I don’t think that it’s a result of iron. Most of the iron that is released from the breakdown of heme is reabsorbed by cells in the bone marrow for incorporation into new red blood cells. That’s why we don’t have a large daily requirement for iron in our diets. Anyhow, what remains of the hemoglobin is then called biliverdin, which is converted into bilirubin and is excreted. This compound can build up in some people and cause jaundice. The colors of these molecules are due to their complex structures, which contain rings of carbon and nitrogen atoms. Intestinal bacteria further modify bilirubin to produce urobilinogen and stercobilinogen. If I remember correctly, the red color of blood is also due to the porphyrin ring of heme and not iron.
So, you’re absolutely correct to say that it’s a complicated explanation and it has to do with the breakdown of red blood cells, but I don’t think that iron has anything to do with the brown color of poop or the red color of blood.
What other colors of poop are possible?
Poop is mostly shades of brown or yellow, but other colors can arise under certain circumstances. For example, someone with a bleeding ulcer might have tarry black poop from the presence of partially digested blood. Bleeding in the intestine, from an anal fissure or split, for example, can stain the poop red. Some illnesses in babies gives them green or even blue-green poop. But another source of blue poop in children is more innocent: it can come from eating a concentrated source of blue food coloring such as ice cream. Intense red food coloring can produce bright red poop. Sometimes brightly colored foods pass through the gut almost unchanged, and the turd may be speckled with bright red fragments such as pimentos, or bright yellow kernels of corn.
One can experience white poop after consuming a barium milkshake for the purposes of getting an x-ray of the upper gastrointestinal tract.
What is the cause of yellow poop?
According to Michael F., one cause of this is Gilbert's Syndrome. "I have a benign condition known as Gilbert's Syndrome. It affects quite a few people, males mostly, in their teens+. It is a deficiency in the liver where red blood cells are broken down. I was informed when this was diagnosed that the broken down blood cells is what gives poop a lot of its color. People with Gilbert's Syndrome don't process as many blood cells - or not as fast - and their poop tends to be pale brown or yellow from the lower quantity of discarded red blood cell matter. This is especially true if there is less matter in your intestines (i.e., on a diet - as I have noticed) to remove the excess blood cells. Very frightening until you determine what is causing it. Gilbert's is a totally benign thing that doesn't harm anyone, although when a person is sick they can turn yellowish as if jaundiced, but it is not jaundice."
Another cause of yellow poop is a giardia infection. Giardia are tiny Protozoan parasites that can invade the intestines and result in severe yellow diarrhea. It is a dangerous and contagious affliction that doctors are obligated to report to the Center for Disease Control.
What is the cause of green poop?
(Question submitted by ap, CrAzYMiC98 and several others)
I have consulted with a doctor, a physiologist and a microbiologist on this question, and the following summarizes their answers:
Healthy people can have green poop if they eat a diet rich in leafy green vegetables, or if they consume large quantities of food coloring (in ice cream, cake frosting etc.).
Green poop can also be caused by excess iron in the diet, from dietary supplements, for example. If the body does not absorb all the iron consumed, the iron may stain the poop green, the color of iron (II) salts. Ordinarily, the green color may be masked by the normal brown poop color, but if digestion is thrown off by illness so that bilirubin is less concentrated in the intestine, the green color may become apparent. This can happen when a person is afflicted with diarrhea.
Green poop in sick babies may come from iron in baby formula not being properly absorbed, or by green pigments in bile salts (again, green from iron).
Why is bird poop white?
(Question submitted by Sarah Beth)
Unlike mammals, birds don't urinate. Their kidneys extract nitrogenous wastes from the bloodstream, but instead of excreting it as urea dissolved in urine as we do, they excrete it in the form of uric acid. Uric acid has a very low solubility in water, so it emerges as a white paste. This material, as well as the output of the intestines, emerges from the bird's cloaca. The cloaca is a multi-purpose hole for birds: their wastes come out of it, they have sex by putting their cloacas together, and females lay eggs out of it.