Why don't we see more places like Pompeii (Vesuvius tragedy)? Why is that not a concern today for those living near volcanoes? | AskScience Blog

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Saturday, January 30, 2021

Why don't we see more places like Pompeii (Vesuvius tragedy)? Why is that not a concern today for those living near volcanoes?

Why don't we see more places like Pompeii (Vesuvius tragedy)? Why is that not a concern today for those living near volcanoes?


Why don't we see more places like Pompeii (Vesuvius tragedy)? Why is that not a concern today for those living near volcanoes?

Posted: 29 Jan 2021 05:54 PM PST

I get that volcanoes typically aren't super scary, because of warnings and evacuation and all that - but the heat flash that came out of nowhere and killed everybody within seconds - has that only happened once that we know of? Couldn't it happen again in Hawaii or Japan or anywhere else with a city near a volcano?

submitted by /u/heyimjason
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Now that we have multiple vaccines approved for preventing covid, what's keeping laboratories around the world of pooling together their resources and producing doses for 100% of the world population in weeks instead of years?

Posted: 30 Jan 2021 03:49 AM PST

I'm focusing on possible technical limitations rather than political ones. Is there a maximum theoretical rate at which you can produce a given vaccine? Is it raw materials, equipment, work force? At a sale price of 2 or 5 USD a dose, it's relatively cheap to produce and easily payable by the world's countries combined.

submitted by /u/rlemmie
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Why is it that a vaccine like J&J can reduce severity of Covid-19 even in cases where it doesn’t provide full immunity?

Posted: 29 Jan 2021 12:08 PM PST

The trials indicated that full immunity varied by country, probably due to the different strains. But it was effective at reducing severity across the board at similar rates, regardless of strain. Why does that happen?

submitted by /u/dch222
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How are Flu Vaccines created and tested each year in time?

Posted: 30 Jan 2021 04:38 AM PST

If there are multiple strains of flu that keep mutating each year and the determination of which flu strains to vaccinate against are decided in the February prior to each flu season, how are manufacturers able to create and test the efficacy of the vaccine in time? How does that process compare with the COVID vaccines development and testing, particularly with regard to the COVID vaccines that are being produced using the standard method of using eggs?

submitted by /u/Crayola_Chomper
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How do lie detectors work? How accurate are they?

Posted: 30 Jan 2021 06:06 AM PST

(in theory) Could you create a fission reaction with any element if its brought to an near unstable state or isotope?, and what would you need to use to create this reaction for different elements?

Posted: 30 Jan 2021 05:57 AM PST

How does long term, childhood trauma physically change the body? And are the effects reversible?

Posted: 29 Jan 2021 06:56 AM PST

How efficient is modern lighting technology (e.g. LED lighting) at converting energy to visible light? What are the factors limiting higher efficiency? Are they likely to ever be overcome?

Posted: 29 Jan 2021 10:43 AM PST

I tagged the question as Engineering since I'm asking about the current practical applications, but it seems to also fit Physics just as well.

As a follow-up question that was too long to fit the title, what major breakthroughs are we likely to see (if any)? Anything new "just around the corner"?

submitted by /u/twowheels
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Why do scientists listen for radio waves when looking for intelligent life?

Posted: 29 Jan 2021 07:26 AM PST

Wouldn't it stand to reason a species that has invented intergalactic travel would have something more advanced than radio waves?

submitted by /u/DietSnapple9
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Are the seemingly chaotic curves of the small intestine the same in almost everybody, like the shape of the hand, or do they follow different paths in different people?

Posted: 29 Jan 2021 01:12 AM PST

About Newton’s third law... if I push a toy car and an equal and opposite reaction is exerted on my hand as I do so by the point of application of the force, wouldn’t the two forces cancel each other out and the car would remain in equilibrium?

Posted: 29 Jan 2021 10:15 AM PST

Has the impact of contracting COVID when vaccinated be studied? Until that, what are the expectaitons?

Posted: 29 Jan 2021 01:56 PM PST

Current COVID vaccines are not 100% efficacious—not claiming any vaccine ought to. While Pfizer/BionTech and Moderna near it with, respectively, 95% and 94.1% efficacy, other vaccines such as Astrazeneca's and JNJ get a lower efficacy, respectively, of 60-70% and 66%.

The efficacy of all vaccines could be lower to COVID variants (UK variant, South Africa variant, Brazil variant), for instance Novavax which has 89% as overall efficacy, but downs to 49.4% to South African variant.

The vaccines though have proved nonetheless to reduce the severity of disease, such as no vaccinated volunteer being hospitalized from COVID in Moderna's and AZ's Phase 3 trials (which may mean 100% efficacy against hospitalization).

The question is, if you're in the unlucky percentage, what is expected to happen in your body if you turn positive some way to Sars-cov2? People normally affected from COVID can have mild or none symptoms to moderate/severe conditions such as pneumonia, organ's damage, low O2, blood clots, or death. Can you still develop pneumonia even if your immunity is at its best? Can you become a Covid long hauler?

The impact of reducing (or eliminating) hospitalizations by the vaccines is reassuring, but more would be (for me and many other people, I suppose) knowing more about it. If for example, a different variant (like SA or Brazilian) will become dominant, mining even the best vaccines' efficacy. Or just if you're unlucky enough in your country to get able only to take a lower efficacy vaccine.

submitted by /u/R0gerBlack
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How is a flat phone battery activated wirelessly to charge up again?

Posted: 29 Jan 2021 04:50 AM PST

i.e. your phone is completely dead and you place it on the wireless charging pad

How does the phone 'know' the charging field is present, enough to be able to start charging?

submitted by /u/turbo_dude
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