Score
Title
98
AskScience Panel of Scientists XVIII
550
AskScience AMA Series: I am Melinda Krahenbuhl and I am the director of the Reed Research Reactor, the only nuclear reactor operated primarily by undergraduate students. AMA!
8468
What elements are at genuine risk of running out and what are the implications of them running out?
269
Can you break sound barrier under water or any other material?
4021
What’s the largest star system in number of planets?
19
Why does plastic turn white at the creases when folded/bent?
3
How does thermal imaging work?
21
Do microwaves leave residual changes to molecules after heating?
4
Can a setup of hall engines provide enough thrust to keep a satellite stationary above earth?
2
Does the temperature have any (noticable) effect on air resistance?
6
How does a memristor work?
1
How does radiation poisoning work?
1
How is the height of the mountain measured?
3827
What is the effect, positive or negative, of receiving multiple immunizations at the same time; such as when the military goes through "shot lines" to receive all deployment related vaccines?
4
If a planet had a radius that was equal to the altitude of Earth’s geosynchronous orbit, but had the same mass and rotational period as the Earth now, would there be reduced or zero gravity on the surface?
1
What is lost and what is preserved in a particle collider?
8
Why does snow melt in the sunlight, even when the temperature outside is below freezing?
11
Mar's summer temperature can be 20 celsius. Could a human survive with just an oxygen mask?
2
Is there an altitude at which there is no longer a speed of sound?
0
How would a moving target affect the rate of nuclear fission vs a stationary target?
14
What would a spaceship moving at 0.9c firing lasers both in front of it and behind it look like to an external reference frame?
6
Does adiabatic warming occur when air descends in the Earth's polar cells?
24
How does the cosmic microwave background persist? Why hasn't it been distorted and destroyed by new sources of energy pumping into space?
6
How does cancer metastasis work?
7
Can a comet maintain an atmosphere?
1
How does RFID blocking material work?
0
Does the Meissner effect relate to Lenzs law?
9
Why hasn't The Asteroid Belt formed a planet?
10
Can you use a normal (CMOS) camera for detecting scintillation?
3
How do people know that the Island of Stability exists? And could there possibly be another "island" after it?
59
How can brain cells cause tumours even though they can not multiply?
7
How far back can you go before carbon dating becomes unreliable?
2
How does a computer process “simple” events?
1578
Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
3
What is the nonrenewable fuel cost to produce x quantity of electricity?
1132
What triggers beta particles to form, and for what reason can they not penetrate substantially thick aluminium?
0
What is the strongest a magnet could be?
1242
If capacitance increases as distance between plates decreases, why aren't there very small 1F capacitors?
0
What makes astronomers think life in general isn't possible on gas giants?
1
How applicable are Newtonian Physics in real life? Is it completely false or are there some concepts which can be used to accurately predict real-life situations?
1050
is it possible to move an object in circular motion using magnets?
4
What would hydrogen in metal form look like?
133 mutatron It's [significant, but not the main source of global warming](https://www.skepticalscience.com/how-much-meat-contribute-to-gw.html). CO2 is now at about 405ppm, while methane is at 1.8 ppm. Even taking the highest multiplier for methane only gets you to 144 equivalent ppm. And there are many other sources for methane besides animal agriculture, including leakage from oil and natural gas wells.
50 Scouterr It isn't so much what the cows produce but the volume of fossil fuels used to produce that pound of ground beef in your supermarket. You have to think of the entire supply chain from fertilizer to grow grass and corn, to pesticides for spraying weeds in pastures, to hauling cattle from pasture to packaging, and all of the manufactured consumables along the way. They take up a massive amount of resources that could be used elsewhere, but man are they tasty.
69 ChangeStartsHere There are several issues with beef that goes beyond GHG (greenhouse gas) emissions. It is also more land intensive and water intensive. Checkout the 6th graph from the world resource institute (a highly respected data-driven sustainable policy think tank) http://www.wri.org/blog/2016/04/sustainable-diets-what-you-need-know-12-charts
6 somedave Yes a huge about of methane is produced by cattle as others have mentioned. [There is also an additional impact of deforestation as rain-forest is cut down to make way for new grazing pastures](https://rainforests.mongabay.com/0812.htm) and high water usage, as well as opportunity cost associated with land being used for pasture. Depending on how you allocate the numbers and weight different factors, dairy and beef farming is one of the major contributors to agricultural global warming, which is similar in it's contribution to ALL transport (~13%). Edit: For clarification I do mean all agriculture makes roughly the same annual contribution as transportation.
5 flyboy_za There's an interesting documentary called Cowspiracy which addresses this. The guy's numbers put methane at way more responsible for climate change than anything else, if he's right about the numbers, and also for how much water it costs and space is needed to raise livestock for food. I don't know enough to challenge what he says, but the whole thing is an eye-opener.
6 [deleted] [removed]
138 0 mutatron It's [significant, but not the main source of global warming](https://www.skepticalscience.com/how-much-meat-contribute-to-gw.html). CO2 is now at about 405ppm, while methane is at 1.8 ppm. Even taking the highest multiplier for methane only gets you to 144 equivalent ppm. And there are many other sources for methane besides animal agriculture, including leakage from oil and natural gas wells.
48 0 Scouterr It isn't so much what the cows produce but the volume of fossil fuels used to produce that pound of ground beef in your supermarket. You have to think of the entire supply chain from fertilizer to grow grass and corn, to pesticides for spraying weeds in pastures, to hauling cattle from pasture to packaging, and all of the manufactured consumables along the way. They take up a massive amount of resources that could be used elsewhere, but man are they tasty.
67 0 ChangeStartsHere There are several issues with beef that goes beyond GHG (greenhouse gas) emissions. It is also more land intensive and water intensive. Checkout the 6th graph from the world resource institute (a highly respected data-driven sustainable policy think tank) http://www.wri.org/blog/2016/04/sustainable-diets-what-you-need-know-12-charts
7 0 somedave Yes a huge about of methane is produced by cattle as others have mentioned. [There is also an additional impact of deforestation as rain-forest is cut down to make way for new grazing pastures](https://rainforests.mongabay.com/0812.htm) and high water usage, as well as opportunity cost associated with land being used for pasture. Depending on how you allocate the numbers and weight different factors, dairy and beef farming is one of the major contributors to agricultural global warming, which is similar in it's contribution to ALL transport (~13%). Edit: For clarification I do mean all agriculture makes roughly the same annual contribution as transportation.
6 0 flyboy_za There's an interesting documentary called Cowspiracy which addresses this. The guy's numbers put methane at way more responsible for climate change than anything else, if he's right about the numbers, and also for how much water it costs and space is needed to raise livestock for food. I don't know enough to challenge what he says, but the whole thing is an eye-opener.
5 0 [deleted] [removed]