If you're new here, you may want to subscribe to my RSS feed. Thanks for visiting!

I’m volunteering to help clean up the High School grounds in Western Washington state which has been neglected for many years and has a large amount of moss growing throughout the school grounds - particularly the outside walkways. We’re trying to use no toxic chemicals. Is there a safe and easy method? We have used a pressure washer in one area which took a long time and couldn’t remove the very very thick moss. The moss is also growing back already in less than a year. Does anybody have experience with a garden flamethrower, bleach, vinegar, or Safer brand Moss killer? Any other recommendations?

I took my blood pressure three times today:

1) 105/55
2) 102/60
3) 114/52

Do I have low blood pressure? My doctor never said anything about it but whenever I go I’m all nervous so its a little higher. My dad (had high blood pressure) told me his doctor told him that the number you take at home is more accurate since you are more relaxed.

I’m only wondering since I’ve been feeling really cold even when it’s really warm/hot out and I heard that low bp is a sign of that.

And what is the normal bp of a 13 yr old girl? (- me)

ok mu blood pressure is 160 over 90 sumthin is this bad and idk why it wood be high cuz im 510′ and 154 pounds
is it high

Hi there,

I’ve always been an avid science hobbyist and I recently started thinking about a potential ‘last option’ survival technique that, although perhaps not always the most efficient, might provide an additional day or two of life.

For an example, I’ll use the typical plane crash scenario where you’re supplied with basic materials and a very limited supply of consumables for nourishment. The terrain is extremely dry and there isn’t a renewable source of water anywhere. You’re starting to dehydrate, and urination isn’t taking place.

Get 3 containers (preferable transparent, such as 500ml plastic coke bottles), 2 of which are relatively the same shape and size. The other container will be called the 3rd container. Make a small wound on an accessible body part with a sharp object to allow a slow but controllable blood flow into the 3rd container. Drain approximately 500ml of blood into the container. Allow the container to rest upright, while applying pressure to the wound and allowing for clotting of blood to stop the hemorrhaging.

After an hour or so, the plasma and blood will separate, with the lighter plasma on top and the heavier protein-enriched blood cells at the bottom. Extract the pale-yellow plasma into one of the first 2 containers.

Attach the first empty and second container that contains the plasma together at the mouth of the container. Make sure that the angle of the containers are just about level, with the container of plasma slightly higher than the empty container, as long as the plasma does not flow into the second container. Place the attached containers into the sun for a few hours.

Since the plasma consists 92% of water and roughly 8% of proteins, the Sun’s heat will evaporate the water from the plasma, allowing condensation to take place at the top of the bottle, which will allow it to run down the bottle into the first, empty container.

If 500ml of blood was drawn, roughly 55% of this makes up for plasma, which leaves you with about 260ml of pure drinkable water in the second container after full evaporation. The average human has about 6 litres of blood. The heart regenerates blood, and the wound will heal if you’re able to find an alternative source of water and food before you die.

I realize that draining 500ml of blood into a container and making the above concoction probably won’t leave you feeling very good or even alive in most cases, but is the science behind it right? I also didn’t supply a technique of seperating the plasma from the blood cells, so that would need some additional creativity.
As per the existing replies, I want to keep the ‘debate’ regarding this a little less personal. Why the trolling?

I mentioned that I only wanted the scientific plausibility of it, not so much a medical one. If I didn’t realize that the blood loss versus re hydration ratio was a problem, I’d also be unable to use the internet due to lack of common sense.

The question was whether or not its POSSIBLE to retrieve water using evaporation and condensation from plasma.

I have this tank: http://www.trademe.co.nz/Sports/Paintball/Accessories/auction-257581633.htm
And i want to fill it up from my dive tank at home using this: http://www.trademe.co.nz/Sports/Paintball/Accessories/auction-257348121.htm

I was wondering wether i could use it as it, it compressed air, not high pressure air.

High blood pressure teenager??????????????????????…
ok mu blood pressure is 160 over 90 sumthin is this bad and idk why it wood be high cuz im 510′ and 154 pounds

my heartbeat beats really hard and fast sometimes, or slow and pounding, like I can feel it throughout my entire upper torso. Whenever I lift anything or run just short distances I get very short of breath quickly and my heart rate jumps to astronomical numbers in seconds forcing me to sit down. I don’t think that’s normal, but the doc says Im fine. i also get frequent PVC’s, and dizziness when I stand up. I get frequent heartburn and acid reflux, with a sudden onset this year, which aggravates it. Im 22yo, smoker, BMI of 20. No diabetes or high blood pressure. and seemingly relatively healthy.
Im also really tall. About 6 foot 3.

I was diagnosed today with preeclampsia. My Dr. didnt seem to concerned but im worried sick! My blood pressure was 140/88 and im so swollen I hurt. I had small amounts of protein in my urine. Did you start out like that and it get worse fast? Im scared its going to get bad and be deadly. I am a worry wart I know. She didnt put me on bedrest or anything just that im going back again in a few days to be checked again and to monitor my blood pressure. Did you have it slightly like me then it went from bad to worse quick? Were you nauseaus? throwing up? what happened to you?
I am 37 Weeks now.

4. Humans have difficulty breathing at high altitudes because:
a. O2 makes up a lower percentage of the air.
b. the temperature is lower.
c. the air is dried.
d. the partial pressure of O2 is lower.
e. all of the above.

1. for each of the following calculations, assume that the pressure remains constant.

a) the temperature of a 9.25 L sample of oxygen gas is changed from 200 K to 600K. calculate the new volume of the gas.

b) 25.0 mL of helium gas is heated from 20 degrees celcius to 120 degrees celcius. calculate the new volume of the gas.

c) 15L of neon gas is cooled from 80 degrees celcius to -25 degrees celcius. calculate the new volume of the gas.

2. natural gas is stored in an undergound storage tank, at a pressure of 425kPa and a temperature of 15 degrees celcius. the volume of the tank is 1500 L. what volume will the gas occupy if it released into a pipeline, where the temperature is 25 degrees celcius and the pressure is 105 kPa?

3. a) the weakest point in a compressed gas cylinder is the valve. explain why most workplace health and safety codes require compressed gas cylinders to be kept upright and chained to a wall.

b) describe the risk to workers if a cylinder of a compressed gas accidentally fell and the gas valve was ruptured. Use Boyle’s law to support your answer.

c) some gas cylinders are fitted witha device called a pressure relief valve. if the pressure inside a cylinder reached a dangerously high level, the valve partially opens, allowing some of the gas to escape. describe one situation in which a pressure relief valve may open.