Why do antigen rapid tests not work after 15 minutes? | AskScience Blog

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Tuesday, September 28, 2021

Why do antigen rapid tests not work after 15 minutes?

Why do antigen rapid tests not work after 15 minutes?


Why do antigen rapid tests not work after 15 minutes?

Posted: 27 Sep 2021 10:32 AM PDT

I've used two different types of antigen rapid tests. Both say that the results aren't valid if more than fifteen minutes have past since testing (dropping the solution onto the test kit.). Why is this so? Do the coloring/colored molecules that do the binding no longer work, or weaken, after 15 minutes? Or does a positive turn into a negative?

submitted by /u/quillqueer
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Does the wood from different trees burn at different temperatures when made into charcoal?

Posted: 27 Sep 2021 06:29 PM PDT

Specifically I was wondering about a particular tree, Osage Orange, that has an extremely high burning temperature. If charcoal was made from its wood would it burn hotter than charcoal from another tree thats wood doesn't burn as hot? Sorry if I got the tag wrong, i wasn't sure whether to use chemistry or biology.

submitted by /u/PsychopathicDiAngelo
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Is the flu shot the same in different parts of the United States?

Posted: 27 Sep 2021 03:33 PM PDT

If I got a flu shot in Oregon and then moved to Maine, would I still be protected? I am moving 3,000 miles across the country, and I was planning to get the flu shot before I move - should I wait until after I move?

submitted by /u/platinumplantain
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Can nuclear waste still be used for energy?

Posted: 28 Sep 2021 06:48 AM PDT

As far as I'm aware, waste fuel from nuclear power plants is still radioactive/fissile. Seeing as waste management seems to be the biggest counterpoint to nuclear energy, what can be done with the waste?

Can you use a different configuration of reactor which generates energy from the waste?

Or is there a way to speed up the half life so the waste is more stable/less dangerous?

submitted by /u/StoneyBolonied
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How are age groups decided for the COVID vaccine?

Posted: 27 Sep 2021 03:07 PM PDT

The Pfizer-BioNTech might soon be approved for 5-11 year olds. How are these age groups decided? Is it largely arbitrary or historical? By expected weight? Or is the 'maturity' of an immune system by a certain age a factor?

submitted by /u/vostok412
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What determines the viscosity of oils?

Posted: 28 Sep 2021 05:49 AM PDT

What is the most culinarily elaborate “dish” made by a nonhuman animal?

Posted: 27 Sep 2021 02:33 PM PDT

Whether it involves combining two separate foods, cooking the food, or preparing it some other way, what the most complicated transformation that an animal has made to its meal?

submitted by /u/VisceralSardonic
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What causes sheet metal to make the *wobble* sound when oscillated?

Posted: 27 Sep 2021 01:18 PM PDT

Example of phenomenon: https://www.reddit.com/r/oddlysatisfying/comments/pwi4na/the_sound_these_sheets_of_metal_make/?utm_medium=android_app&utm_source=share

My two thoughts were either waves of air compression created by the movement, or perhaps the metal itself "readjusting" to the bending and making that sound.

submitted by /u/yodog5
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Why was the Higgs Boson being lighter than expected such a big deal?

Posted: 27 Sep 2021 02:07 PM PDT

Why are gauge bosons called "gauge bosons"?

Posted: 27 Sep 2021 02:59 PM PDT

You couldn't prove it by me that they have a whole lot to do with gauging anything, so where did that name come from?

submitted by /u/Return_of_Hoppetar
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How do COVID swabs work if COVID doesn't last very long in warm temps outside of the body?

Posted: 28 Sep 2021 12:34 AM PDT

I know that they DO work, I just don't know HOW. I know that sometimes the samples aren't actually tested for hours after collection. Is there some sort of chemical on the swabs that preserves the sample? Or does the test somehow pick up on dead virus cells? (Using the medicine flair because this applies to a lot of different types of viral testing.)

submitted by /u/heyimjason
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Is there anyway of knowing how many generations of stars it took to make us/ earth?

Posted: 27 Sep 2021 07:13 AM PDT

Basically the title.

I know everything heavier then hydrogen is made in a star, it goes supernova, and elements get scattered. The dust from that is formed into a new star and repeats.

"we are all made of star stuff"

How many of these cycles did it take to get the elements we have on earth.

submitted by /u/sgtsteelhooves
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How does a fan creare low pressure?

Posted: 27 Sep 2021 01:00 PM PDT

I have been googling for the past days trying to figure out how fans are used to suck things etc. The only thing I could find was that fans create low pressure but no website explined how? What does a spinning fan do to the surrounding air? How does it cause low pressure?

submitted by /u/TekTekNa
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