Score
Title
86
AskScience Panel of Scientists XVIII
2972
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?
54
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!
1567
Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
1122
What triggers beta particles to form, and for what reason can they not penetrate substantially thick aluminium?
1241
If capacitance increases as distance between plates decreases, why aren't there very small 1F capacitors?
1048
is it possible to move an object in circular motion using magnets?
58
Do wild animals get physical addictions to substances?
6
How can brain cells cause tumours even though they can not multiply?
17
What causes the increased grip on paper when you lick your finger?
11
Would someone who got into an accident that put them into a coma for a couple of weeks still be addicted to a drug that they were addicted to prior to the accident? Why or why not?
1
Why do you loose the coefficient when you differentiate ln(2x) and then integrate it to ln(x)?
4
Why does sleep deprivation and lack of sleep increase depression?
7
Is there any evidence that pornography is a public health risk?
3
How fast does a sun blow up? Not as in life span, but say a supernova, how long would it take for the process to complete?
3
Can the effect of a "bunker buster" be accurately predicted, in relation to the target's compressive strength?
0
What are the basic units of measurement, IE time, distance, mass etc, that can be used to derive every other unit, such as joules, power, or magnetic force?
37150
Why is it that during winter it's not uncommon to have days with abnormally high temperature and summer-like weather, but in the summer it never drops to winter-like weather for a day?
33
How does Positron Emission Topography (PET) work?
1
Why are mercury salts a common first choice for heavy atom soaks in protein crystallography?
99
What happens to the spin of an electron when it leaves a nucleus?
1
Is there any evidence to suggest that biracial people are less susceptible to genetic diseases?
1
How does homolytic fission make radicals? Don't both of the atoms still have the same amount of electrons before the covalent bond and after the bond is split?
2
What kind of sound do the stars make?
10
What happens if a natural gas deposit in the ground ignites?
7
How can we hear when someone is smiling?
10
How does the Hubble Telescope take pictures?
1
Do genetics influence the way one's voice sounds?
2
[Physics] What makes us distinguish between hollow and solid objects so easily by just tapping the surface?
4
Is there anything that can bond to TRPV1 receptors that would completely or relatively dull capsaicin before ingesting it?
7
Do you burn the same number of calories during a given activity when you're fit as when you're unfit?
0
Can someone explain my questions about the orbits of the James Webb Space Telescope?
1
How are defining mutations in haplogroups chosen?
8
What about the properties of bronze makes it good for musical instruments and bells?
1
How many cell layers thick is the human epidermis?
5
Why does sand clump together when water is added?
3
How do the laws of conservation work with the concept of 'isolated system' being that quantum fields are boundless?
8
How are decisions made on where large hydroelectric dams are located?
73
If the moon was created from an impact with Earth, could there be “Earth rocks” deep within the Moon?
4
How are we able to put more space/memory into processors, GPU's, ram, hard drives, etc. as time progresses?
8
Have animals been observed using facial expressions to communicate among themselves?
174 Friskei For a short while; it’s proposed that it would have cooled our climate off slightly from suspended particulate matter scattering insolation. An interesting fact though, radioactive dust deposited fairly uniformly around the world, so we can still see this layer in ice sheets which helps narrow the window for dating “older ice”.
6 shiggythor The internal degrees of freedom of a solid allow to convert incoming em-radiation to lower frequencies (read: light to heat). If that happens in the higher atmosphere, the now lower frequency radiation will not penetrate the atmosphere and thus less sunlight will reach the ground. Thus, solid particles (ash, dust) in the upper atmosphere are a coolant and big explosions tend to throw a lot of those into the atmosphere. Thats the idea behind the so-called nuclear winter after a potential nuclear war. However, the actual nuclear tests did not throw that much matter into the air compared to large volcanic eruptions. Thats why the nuclear tests are barely visible in the global temperature curve, while big volcanic eruptions are really seen as a dip in the temperature for a few years. Anyways, solids are always heavier than air, and thus fall back to the ground over a few years. Thus those impacts are short-lived and do not contribute to long-term changes. What impact the nuclear test did have though was to throw a lot of radio-active isotopes localized into the air. We can track those and measure their concentration in different locations over the years to learn how these isotopes get distributed over the earth by winds. This helped us a lot to understand global wind currents and is vital in order to build realistic climate simulations. Especially C-14 contains a lot of information, since the concentration is determined by the interplay of three factors: natural C-14 generation from interations of C-12 isotopes with cosmic rays (which leads to a balance between regeneration and decay and thus a nearly constant natural concentration), an enhanced C-14 generation through the nuclear test (which then decays again over time) and the burning of fossile carbon (in which all C-14 is decayed, therefore not present). When we manage to disentagle those influences, we can learn a lot about the spread of pollution, the human influence on C02 concentrations and where all the CO2 that we produce ends up (plants, ocean, atmosphere). Hopefully, that knowledge will in the future have some influence on the climate because it might motivate us to act accordingly.
4 Wapped709 An interesting fact I read was that due to nuclear testing the background radiation of the planet was changed so significantly that steel forged before the testing has become much more valuable due to its lower radiation levels compared to currently forged steel. Apparently this is important for devices that are used to detect radiation levels and because of its value a lot of 'pre-nuke' shipwrecks are scavenged for their steel.
1 [deleted] [removed]
176 0 Friskei For a short while; it’s proposed that it would have cooled our climate off slightly from suspended particulate matter scattering insolation. An interesting fact though, radioactive dust deposited fairly uniformly around the world, so we can still see this layer in ice sheets which helps narrow the window for dating “older ice”.
4 0 shiggythor The internal degrees of freedom of a solid allow to convert incoming em-radiation to lower frequencies (read: light to heat). If that happens in the higher atmosphere, the now lower frequency radiation will not penetrate the atmosphere and thus less sunlight will reach the ground. Thus, solid particles (ash, dust) in the upper atmosphere are a coolant and big explosions tend to throw a lot of those into the atmosphere. Thats the idea behind the so-called nuclear winter after a potential nuclear war. However, the actual nuclear tests did not throw that much matter into the air compared to large volcanic eruptions. Thats why the nuclear tests are barely visible in the global temperature curve, while big volcanic eruptions are really seen as a dip in the temperature for a few years. Anyways, solids are always heavier than air, and thus fall back to the ground over a few years. Thus those impacts are short-lived and do not contribute to long-term changes. What impact the nuclear test did have though was to throw a lot of radio-active isotopes localized into the air. We can track those and measure their concentration in different locations over the years to learn how these isotopes get distributed over the earth by winds. This helped us a lot to understand global wind currents and is vital in order to build realistic climate simulations. Especially C-14 contains a lot of information, since the concentration is determined by the interplay of three factors: natural C-14 generation from interations of C-12 isotopes with cosmic rays (which leads to a balance between regeneration and decay and thus a nearly constant natural concentration), an enhanced C-14 generation through the nuclear test (which then decays again over time) and the burning of fossile carbon (in which all C-14 is decayed, therefore not present). When we manage to disentagle those influences, we can learn a lot about the spread of pollution, the human influence on C02 concentrations and where all the CO2 that we produce ends up (plants, ocean, atmosphere). Hopefully, that knowledge will in the future have some influence on the climate because it might motivate us to act accordingly.
4 0 Wapped709 An interesting fact I read was that due to nuclear testing the background radiation of the planet was changed so significantly that steel forged before the testing has become much more valuable due to its lower radiation levels compared to currently forged steel. Apparently this is important for devices that are used to detect radiation levels and because of its value a lot of 'pre-nuke' shipwrecks are scavenged for their steel.
1 0 [deleted] [removed]