Score
Title
381
AskScience Panel of Scientists XVII
693
Help us fight for net neutrality!
10921
From my kid: Can you put a marshmallow on a stick out into space and roast it with the sun?
3363
Hein et al (2017) have explored scenarios for sending a spacecraft to the recently confirmed interstellar asteroid "Oumuamua". What payloads and capabilities would we wish to prioritize on the exploration of this strange and peculiar object?
24
On my bike: is it more efficient to pedal fast in a low gear or slower in a high gear?
12
Is deep-earth nuclear fission heating the Earth's interior?
5
What exactly is the Van Allen radiation belt?
3
Ask Anything Wednesday - Engineering, Mathematics, Computer Science
3
How are doctors able to determine genetic abnormality in a fetus, by testing the mother’s blood?
6
Why can't powerbanks charge while being charged?
6
Can blue light cause cancer? What about UVA? Where is the threshold?
5
How, or why, do refraction and dispersion occur?
4
Is it a coincidence that the moons rotation around its axis matches the duration for its revolution around the earth? Or is there some scientific explanation on how these aligned in such a fashion?
2
Are all prime numbers smaller than the biggest prime number discovered?
4
How does restricting Internet work?
1
Are electrostatic interactions photon-mediated?
21
Why are radio waves and microwaves more damaging to the human body than light waves?
2
How does your body heal cuts?
11
In my Psychology textbook it says that cortisol (a result of stress) reduces telomerase activity, therefore speeding up the aging process, however, I know that exercise also releases cortisol, yet is known to combat aging - how?
1
Why children with adenoditis fall behind in their neurophychiatric development and do they recover in that aspect after the inflammation is gone?
1
Why does the index of refraction of water change with temperature?
2
I measured an imaginary component of Earth's magnetic field?
11
Why do planets orbit in planes?
3
Why don't electrons in a superconductor radiate away their energy?
2
Why does water behave like a mirror?
1
Do cephalopods control their camouflage consciously, if yes how exactly can an animals thought's change it's cells?
113
Why does the infinite series 1/n diverge?
1
How do they know 'Oumuamua is elongated vs of assymetric albedo? (Bonus Question: Is the assumed rotation stable?)
1
Why do antiparticles go back in time? For example, when using Feynman diagrams.
13
Do we create memories of every single event that happens to us?
1
Which is more biologically dangerous, X-rays or Gamma rays?
6
Can dogs, in theory, talk?
1
Is there any specific unit or measurement system for poisoning levels in general?
8
Do people with bionic limbs still experience phantom pain?
323
Why, when you are paralyzed from the neck down, are your involentary organs not paralyzed as well?
4
How is voltage created in a battery cell and how is it maintained at a ~constant value throughout its life/usage?
4069
Why are solar-powered turbines engines not used residentially instead of solar panels?
0
Why don't the absorption lines and emission lines in stars cancel out?
5
why can't crystalline solids bond back together after cracking apart?
37
Is attraction caused by us wanting to reproduce with peoole with better genetics in areas we lack?
2
What is "Reduced Iron" found as an ingredient in food?
51 eggplantosarus What birth control pills actually do is not quite preventing the 28 day menstrual cycle from beginning, but tricking your body into staying in the luteal phase (days 15-28) the whole time rather than cycling. Since the build up to ovulation happens days 1-14 of the cycle, this keeps you from ovulating which keeps you from getting pregnant. [This diagram](https://media1.britannica.com/eb-media/07/55707-004-140E41F8.jpg) shows the changes in hormone levels during the menstrual cycle. The pictures in the top row show the ovaries, with ovulation at day 14. The middle part is the changes in hormone levels and the bottom row is the thickness of the lining of the uterus. Hormonal birth control pills typically are a mix of estrogen and progesterone, though progesterone only pills are also (less) effective. When you bleed during placebo week, it is technically known as "withdrawl bleeding": the abrupt withdrawl of progesterone is what causes the uterus to shed it's lining. This happens with or without ovulation. If you miss one pill, there is a chance that you could ovulate, though that chance is very small-- ovulation is unlikely with just on missed pill, which is why the advise is typically to take two pills the next day if you miss one. However, there is a lot of woman-to-woman variation in the days, so in order to be sure to prevent pregnancy pills should not be skipped.
50 0 eggplantosarus What birth control pills actually do is not quite preventing the 28 day menstrual cycle from beginning, but tricking your body into staying in the luteal phase (days 15-28) the whole time rather than cycling. Since the build up to ovulation happens days 1-14 of the cycle, this keeps you from ovulating which keeps you from getting pregnant. [This diagram](https://media1.britannica.com/eb-media/07/55707-004-140E41F8.jpg) shows the changes in hormone levels during the menstrual cycle. The pictures in the top row show the ovaries, with ovulation at day 14. The middle part is the changes in hormone levels and the bottom row is the thickness of the lining of the uterus. Hormonal birth control pills typically are a mix of estrogen and progesterone, though progesterone only pills are also (less) effective. When you bleed during placebo week, it is technically known as "withdrawl bleeding": the abrupt withdrawl of progesterone is what causes the uterus to shed it's lining. This happens with or without ovulation. If you miss one pill, there is a chance that you could ovulate, though that chance is very small-- ovulation is unlikely with just on missed pill, which is why the advise is typically to take two pills the next day if you miss one. However, there is a lot of woman-to-woman variation in the days, so in order to be sure to prevent pregnancy pills should not be skipped.