AskScience AMA Series: Experts are warning that measles are becoming a global public health crises. We are a vaccinologist, a pediatrician and a primary care physician. Ask us anything! |
- AskScience AMA Series: Experts are warning that measles are becoming a global public health crises. We are a vaccinologist, a pediatrician and a primary care physician. Ask us anything!
- Why is the heat capacity of liquid water so much higher than its solid and gaseous forms?
- AskScience AMA Series: We're a team of researchers from St. Michael's Hospital, and Peel Regional Paramedic Services in Toronto, Ontario, Canada who specialize in Cardiovascular Health and Resuscitation.
- How are protons and neutrons arranged within the nucleus?
- If light always moves at the same speed in a vacuum, does that mean we can use it to find a stationary point in the universe?
- Imagine that eventually humanity sets out to colonize the universe at near light speed. How much of the universe could they reach before it is too far to catch due to the expansion of space?
- Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
- What's the Role of the Northbridge Chip to Access Memory in Modern PCs?
- Transmitting complex software trough radio?
- Why does the ACL seem to tear so often compared to the PCL?
- Do the frequency of earthquakes in a particular area or along a particular fault increase the chance of a larger earthquake happening near-term?
- What would the universe be like if gravity was a repulsive force rather than an attractive one?
- Is there a physical limit to the level of detail that can be resolved by a telescope?
| Posted: 16 Oct 2019 04:00 AM PDT Measles is one of the most contagious diseases known to doctors. It spreads through the air. Particles of virus can float for up to 2 hours after an infected person passes through a room. People are contagious for 4 days before they have a rash and about 4 days after they get the rash. Because it's so easy to catch, about 95% of a population has to be vaccinated against the measles to stop it from spreading. In 2017, the latest year for which data are available, only 91.5% of toddlers in the U.S. were vaccinated, according to the CDC. The number of cases of measles reported during 2019 is the largest number since 1992. The effectiveness of one dose of measles vaccine is about 93% while after the two recommended doses it is 97%.
We will be on at 12pm ET (16 UT), ask us anything! [link] [comments]  |
| Why is the heat capacity of liquid water so much higher than its solid and gaseous forms? Posted: 15 Oct 2019 04:13 PM PDT I am taking AP Chemistry this year, and we're currently studying thermochemistry. During a lecture where we went over the parts of a heating curve, I noticed that the Cp of liquid water (4.18 joules per grams celsius) was significantly higher than the Cp of its solid and gaseous states(both are close to 2 joules per grams celsius). I asked my teacher why this was, but she didn't have an answer. Why is this the case? Does it have something to do with hydrogen bonding? I get that water is a special case because it has some weird properties, but why specifically? Any help in answering this question is greatly appreciated! [link] [comments]  |
| Posted: 16 Oct 2019 04:00 AM PDT Today is International Restart-a-Heart Day (https://www.ilcor.org/world-restart-a-heart-2019/) and we're here to answer questions you may have about CPR, using an AED, and heart health! Every year in North America there are over 400,000 sudden cardiac arrests. Early CPR (Cardiopulmonary Resuscitation) and the use of an AED (Automated External Defibrillator) can significantly increase the chance of survival.
On the AMA today are:
We'll be on around noon ET (16 UT). Go ahead, and Ask Us Anything! [link] [comments]  |
| How are protons and neutrons arranged within the nucleus? Posted: 16 Oct 2019 01:01 AM PDT Are there different lattices as with atoms? Is there only a single stable configuration? How do additional neutrons (isotopes) affect the arrangement? [link] [comments]  |
| Posted: 15 Oct 2019 08:49 PM PDT Say light is coming at you from the front at 1.1 light speed, and from the rear at 0.9 light speed. Would that mean you are moving away from a stationary point in the universe at 0.1 light speed? Is this a method used? If not, what ways do scientists do it? [link] [comments]  |
| Posted: 15 Oct 2019 09:34 PM PDT Assuming that the time it takes for humanity to develop near light speed travel and set out to colonize is negligible on the cosmic scale, how much could we actually reach? Would it be comparable to the observable universe or much smaller? [link] [comments]  |
| Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 16 Oct 2019 08:09 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary Science 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]  |
| What's the Role of the Northbridge Chip to Access Memory in Modern PCs? Posted: 16 Oct 2019 01:26 AM PDT I'm familiar with building computers using a system bus: connecting data, address and control buses directly to all the components in a motherboard. I can see how the Southbridge brings something to the table, by providing a standard clock and common bus independent of different CPUs, but what does the Northbridge do? Isn't it slow/problematic to put something between CPU and memory, the two most important components on a computer? [link] [comments]  |
| Transmitting complex software trough radio? Posted: 15 Oct 2019 06:37 PM PDT Recently I've read an article about how people in Poland transmitted simple software trough radio in the 1980's; you would tune into a certain frequency and write the pulses into a clean tape. Then, you could load it into the computer and play the game or software transmitted to you. Would this be a practical way of downloading and sharing information today? Would it be even possible? [link] [comments]  |
| Why does the ACL seem to tear so often compared to the PCL? Posted: 15 Oct 2019 03:39 PM PDT It seems like 90% of knee injuries I hear about is a torn ACL. The PCL is literally right next to it, and it's hardly ever mentioned.... Why is that? [link] [comments]  |
| Posted: 15 Oct 2019 04:42 PM PDT These Nor Cal earthquakes the last two weeks (and in the last 12 hours) have me a bit on edge. Thanks! [link] [comments]  |
| What would the universe be like if gravity was a repulsive force rather than an attractive one? Posted: 15 Oct 2019 08:54 PM PDT As in, what would the effect be if gravity was F = - G*m1*m2/r^2 in Newtonian terms [link] [comments]  |
| Is there a physical limit to the level of detail that can be resolved by a telescope? Posted: 15 Oct 2019 01:25 AM PDT To speak in more concrete terms - is there any physical law preventing one from building a device allowing them to count the skin cells on a persons nose from of light-years away? [link] [comments]  |
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