- 10 AnswersDieta y vida sana5 months ago
So far I thought that water, being an ingredient basic for life, would be smaller than any biological being that has it as a part. However I was reading an article that, if I did not misunderstand it, reports that latex condoms tested with water can, in 2.6% of the cases, have holes large enough to let the human inmunodeficiency virus pass through them:
They say that the "water leak test can detect holes down to 3 to 4 μm in diameter [...] [whilst] sexually transmitted viruses, on the other hand, with diameters of 0.04 to 0.15 μm,3 are smaller than these holes by more than an order of magnitude".
How is it possible that water cannot penetrate holes that a virus can?
Is it because of the cohesion, the adhesion, or the surface tension of water?
Are the molecules forming so many hydrogen bridges that they become larger than a virus?
Is water not a basic ingredient in the chemical composition of a virus?
The most worrying part is that then the condoms and gloves, at least those tested with water only, are not perfectly blocking viruses, and there is then always risk! I also read that there is a test with electrons, that is more precise (but how much?), but that not every condom nor every glove is tested with it.
Please explain me how a virus can penetrate something that water cannot. Thank you.2 AnswersBiology5 months ago
Por favor algo objetivo, nada de retóricas nacionalistas españolas, ni americanismos, ni "anticolonialismos" que pintan todo como lo más horrible que hubo pasado. Gracias.4 AnswersHistoria8 months ago
Can aluminium paper work to make a room soundproof (towards the outside) because it reflects the sound?
If aluminium reflects the sounds, then, would it block it from going outside if I put it in front of walls or doors or windows?
Is aluminium paper (like the one used with food) enough?9 AnswersDecorating & Remodeling11 months ago
Ceteris paribus.2 AnswersLaptops & Notebooks1 year ago
If I have two laptops with the same specifications but one is made of plastic and another of aluminium (and more expensive), what would be the difference? Would it be worth to pay $150 extra for the aluminium? Have you had both and noticed something relevant different in your experience? Thanks.7 AnswersLaptops & Notebooks1 year ago
In the episode Homer to the Max, Grampa Abe Simpsons gives this speech:
“Wait a minute, the family name is my legacy to you. I got it from my father. And he got it from his father. And he traded a mule for it. And that mule went on to save spring break.” – Abe “Grampa” Simpson.
I don't understand the last sentence.1 AnswerComedy2 years ago
I want to know if it is good or bad to use fertiliser on a germinating seed. I am using a fraction (1/4) of a fertilising stick, on each tiny cup where I planted the seeds.
Is the fertiliser bad or good for that baby plant?
The fertilise is "6-12-6". Nonetheless, apart of this kind of fertiliser, I would like to know if it is good in general or not to use fertiliser with seeds and baby plants.3 AnswersGarden & Landscape5 years ago