What is the biochemical process in seeds that keeps track of cold temperature so that seeds germinate at the correct time? |
- What is the biochemical process in seeds that keeps track of cold temperature so that seeds germinate at the correct time?
- Does the fetus absorb hormones such as cortisol or endorphins from the mother? Does the baby gets dependent and expects to receive it after birth?
- If you could use super slomotion camera that could see light move, what would you see, sitting in a room when you flipped the light switch off? A washing over of darkness, emanating from the light source- or just sudden darkness?
- Since E=mc^2, does a photon create a gravitational field ?
- Is a Single Measurement Precise?
- Why does the derivative of acrtan(x) look like the normal curve?
- When did we become aware that there is no life on Mars?
- Are newborns just 'blank slates'? In other words, can you train a newborn to grow up to be anything you want (a doctor, hitman, mathematician)?
- Can Galaxies "Die" and What Might it Look Like?
- Could someone please give a scenario in which the cardinality of an infinite set becomes important?
- Is there evidence of a moon orbiting a moon orbiting a planet?
- If the edge of the observable universe is 46.5 billion light years away, why is the most distant object ever observed (EGSY8p7) only 13.2 billion light years away and still considered to be 13.2 billion years old?
- Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
- How can a black hole emit x-rays when its gravity is so strong that even light cannot escape?
- What would happen if you frayed the ends of hundreds of small wires connected to two ends of a battery, and brushed them together?
- Would it be possible to use GFP to create glow in the dark tattoo ink?
- Why is it that some craters, notably on the moon, have a small elevation in the centre/point of impact?
- Why is nitrogenase not used in industrial production of fertilizer?
- This reasoning shows that protons have no energy (or momentum). Where did I go wrong?
- Can the collision between two photons create two electrons?
- Is it possible to diffract bacterium?
Posted: Many seeds require a period of cold (stratification) before germinating. How does the seed know that enough time below a certain temperature has passed before germinating? Obviously I realize that temperatures rise in the spring triggering germination but when people are trying to grow seeds they'll put them in the fridge for a certain period of time. The seeds will only germinate after they have spent that minimum amount of time in the cold. Removing the seeds early won't cause germination despite the fact that they went through a cold period. [link] [comments] |
Posted: For example, if the mother is happy and cheerful throughout the pregnancy and releases fluxes of endorphins, does the baby absorbs it as fetus, and expects the flux of endorphins after birth? [link] [comments] |
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Since E=mc^2, does a photon create a gravitational field ? Posted: |
Is a Single Measurement Precise? Posted: I just got back my science midterm and one of the questions I got wrong was bothering me. This was the question (not word for word of course, but same idea). The actual mass of object A is 56.8842 grams. Which of the following is the most accurate measurement of object A __? Which is the most precise __? A) 55.937 grams B) 57 grams C) 56.299104324 grams I wrote in B for being the most accurate (it's the closest to 56.8842). However for the second part I simply wrote "none" because I remember learning that precision comes from having multiple consistent measurements, and we were being asked about a single measurement. I was confident that I caught a trick question, since my teacher has done trick questions on previous tests, but they marked me wrong. They said answer C was correct because precision comes from having the most significant digits. Am I wrong? I feel like the way this question was asked is a bit confusing, so please explain in detail whether or not I'm missing something or outright wrong. [link] [comments] |
Why does the derivative of acrtan(x) look like the normal curve? Posted: I looked up the equation for the normal distribution and I can't see any connections between it and 1/(x2 +1). Are they related somehow? Or are they not really that similar and just mildly resemble each other? Thanks! [link] [comments] |
When did we become aware that there is no life on Mars? Posted: Back on a time before the space exploration, we didn't really know very much about our neighbous in the solar system. So there was a time when the scientific community didn't really know how was the conditions in Mars (and, why not, Venus). My question is: when did we learn that these places are sterile? How did the scientific community react? Where they expecting something else? [link] [comments] |
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Can Galaxies "Die" and What Might it Look Like? Posted: |
Could someone please give a scenario in which the cardinality of an infinite set becomes important? Posted: Could someone describe for me a case in which it would be necessary to denote the cardinality of one infinity as opposed to that of another, and what branch of mathematics this falls under? I'm having trouble thinking of a practical example other than the ring of natural numbers compared to the set of real numbers. [link] [comments] |
Is there evidence of a moon orbiting a moon orbiting a planet? Posted: Has there ever been evidence of a smaller object orbiting the moon of a planet? [link] [comments] |
Posted: Edit: The answer is, it isn't. The figure of 13.2 billion light years is "light travel distance" not "actual distance". "Actual distance" to EGSY8p7, being the distance as a result of universal expansion, is approximately 30 billion light years. Thanks /u/adamsolomon [link] [comments] |
Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments] |
How can a black hole emit x-rays when its gravity is so strong that even light cannot escape? Posted: |
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Would it be possible to use GFP to create glow in the dark tattoo ink? Posted: |
Posted: i've read that the central uplifts are due to gravity but I don't understand the role of gravity there. [link] [comments] |
Why is nitrogenase not used in industrial production of fertilizer? Posted: I was curious if there is a specific reason that we have not made a genetically modified organism that could secretes or at least produces nitrogenase. Is it more complicated, why is this not a practical why to produce fertilizer? Is this currently being researched? [link] [comments] |
This reasoning shows that protons have no energy (or momentum). Where did I go wrong? Posted: Momentum is equal to the mass of an object*its velocity. A photon is massless, therefore it has no momentum. When you plug this into E2 = (pc)2 + (mc2)2, it would mean that photons contain 0+0=0 Joules of energy. Now, we all know that is far from the truth and that photons have both energy and momentum. So, where did my reasoning go wrong? [link] [comments] |
Can the collision between two photons create two electrons? Posted: I have read that it can create an electron as long as the energy in the photons is bigger than the rest mass of an electron. Can we have photons whose energy is greater than the rest mass of two electrons? [link] [comments] |
Is it possible to diffract bacterium? Posted: In a similar fashion to electron diffraction, is it possible to diffract bacterium? [link] [comments] |
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