kenny1999

Hi. Is there any such apps that I can send a file to someone but he can only read the file with the password that I provide to him? It's like zip files encrypted with passwords on PC. I know that I can do it by sharing on Google drive but is there more convenient way? The data of my file is mostly text, no picture.

Can anyone suggest one or a few English nick that should not be only for boy or for girl? In other words, nick normally for boys and girls, i.e. Chris.

Without professional devices, what are all possible ways of testing if gold jewellery is pure and real gold, i.e. 999.9 or 24k? It doesn't matter if it's not 100% accurate but is there any way to make a good estimation?

1 hour ago, Phi for All said:

Not sure you're doing anything more than thoroughly saturating the fibers before you wash the garment, if it's only water and for that long. If the clothes are heavily dirty, I'd pre-soak using some kind of detergent, but only for about half an hour. That's plenty of time for the surfactants to break up any oils or ground-in grime, and then hold on to both water and  dirt so it's washed away. Modern detergents are designed to work with fibers and their colors.

Why are you listening to anyone who just tells you it's "not good to do that" without explaining why?

It's because they did not explain why so I am asking why here....

I always thought that it was good to soak dirty clothes in water for hours before washing but recently I happen to find a lot of advice saying that it is not good to do that. What's the possible problem of soaking clothes in water? Would it weaken the fabric?

For a long time, I'd like to get a smartphone with a large screen but I haven't yet got one because there are some trade-offs, e.g. weight and convenience. If I don't watch videos or play mobile games, I just use my phone to read ebook and information on the web (mainly text and pictures), will it feel a lot better by using a bigger screen? What's your opinion?

I have some used books that are, as said, used, not new, from unknown sources and used extensively by unknown people. Does it need to be sterilized or cleaned and how to if it does?

I know there is something like adhesive tape but it will not leave marks and is designed not to leave marks on paper. Ordinary tape is highly adhesive and could easily damage prints on paper if not removed carefully. What is the name of such thing?

On 11/1/2023 at 7:40 AM, Peterkin said:

If you have a religious faith, the next best consultant would be a spiritual advisor.

Failing that, talking to wise elders (relative, mentor, family friend?) may be useful. If you have a spouse or significant other, they should certainly be made aware of your condition, and might be able to offer support. Consulting books or on-line sources of information may be a good idea, so long as you don't fall into some faddish regimen or self-medication. You could seek out support groups - live or on websites - with similar problems.

Whatever you decide, it's better to share the burden with people you trust than trying to manage on your own.  

Thanks for your meaningful comments. But the problem is, my family members do not feel me no matter how hard I have tried to explain things to them, I know them well, they will never feel me. I have given up. I had regular sessions with a few counselors who were psychologists, I got some temporary relief, but it did not last long. I talked a lot and I talked too much. I think it's time to do something rather than just talk. Or is there any superfood (that should be natural) that will potentially improve one's emotion?

Now, I decided not to wash my sneakers but only use a damp cloth to wipe its surface when it gets obviously dirty. I hope it is the best balance among all other considerations.

Hi all. Is the answer to my question positive? i.e. A little bit more for the cousins on the mother side?

It's said that we share a little bit more DNA with our mother, compared to our father.

Does it also mean that we also share a little bit more DNA with cousins from our mother side, compared to our father side?

10 hours ago, swansont said:

Light hitting at a large angle, as measured from normal (90 degrees). It just “grazes” the surface

Reflection at 90 degrees (called normal incidence) reflects about 4%. As the angle increases it goes up for parallel polarization, and drops for the perpendicular polarization (it goes to zero a Brewster’s angle, where all light is transmitted) and then increases. Out at 70+ degrees reflection is quite strong, but it would be difficult for you to have sunlight reflected into your eyes at a large angle.

I wish I had thought to mention that 😉

Did you mean since the car surfaces are usually roughly finished so light is reflected at a lot of angles so the intensity is largely reduced at any particular angle, and the likelihood of causing retinal damage or eyes is when a lot of light is focused at one angle?

1 hour ago, swansont said:

No, it’s a diffuse reflection, but since there’s a lot of area undergoing reflection and not much to absorb the light, it’s very bright.

Glass transmits a lot of the light, and only reflects a lot at grazing incidence. 

Sorry, what is grazing incidence? And so did you mean even if I believe that the reflected light from the glass cover of the headlight is strong, chances are it's completely safe even if I stared at it directly for a few seconds?

1 hour ago, swansont said:

Diffuse reflected sunlight is not all reflected sunlight. Specifically, it excludes specular-reflected sunlight. Anything that acts like a mirror is undergoing specular reflection. A car has lots of convex curved surfaces, so it probably reflects less light into your eye - you wouldn't see the image of the whole sun, which likely mitigates the danger.

Also, look up snow blindness. A situation where diffuse reflection can be a problem.

I have never lived or been to anywhere with a large area of snow, did you mean the image of the whole sun can sometimes been seen on the snow surface?

What if a particular angle of a car where the reflected light is particularly strong? Which usually happens when the light hits directly on the glass of the headlight and reflects.

We know that direct sunlight is dangerous to eye without any doubt.
It's also widely said that reflected sunlight is also damaging, within a fraction of second.

But I also find an ophthalmologist, whom I believe that it's verified, suggesting that there is no risk from diffuse, reflected sunlight. According to the link below

https://www.aao.org/eye-health/ask-ophthalmologist-q/is-reflected-sun-light-dangerous

What's going to be true?

Is there any risk if I stare at the reflected sunlight from car for a few seconds?

6 balls are drawn from a total of 49 balls randomly. Order does not matter, as long as 6 balls are matched, first prize is won, what is the probability of winning the first prize?

Another question is horse racing. For certain three matches, which may have 10 to 14 horses in total, different horses may have different conditions and abilities so the winning odds of each horse may not be as simple as 1/10 or 1/14. You choose three horses from each of the three matches so you are choosing 9 horses in total, if all 9 horses in three matches finish for the 1st, 2nd and 3rd place, order isn't counted, i.e. ABC, ACB, BAC, BCA, CAB, CBA don't matter.), then you win the jackpot, what is the probability of winning the jackpot? Since number of horses in a match may vary, conditions of horses in a match may vary, I'd like to know how to work it out, rather than the final answers alone.)

I strongly believe that male pattern hairloss is purely genetic, some businessmen like to connect it with other factors like stress, diet or hair treatment products but that is not true. I have been observing hairline and hair quality of many people for a long time and I find that different people could have really different hair quality that do not seem to be affected by any environmental factor. For example, my uncle who is not blood-related to me has four brothers and he is stressful and unhappy all the time, he is over 60 now but his hairline is still nice and perfect and all his brothers don't have any sign of hair loss. My father has lost all his hair and his brothers are all bald, my hair loss started when I was 25.

I was first impressed by this phrase seen in the status of one of my friends, and the I only get to realize today that it is a name of a book. Do you recommend this book? Where to buy?

By the way, where do you guy buy books? Is Amazon Kindle already the best source with the best book reader?

12 hours ago, swansont said:

I knew people in grad school who studied adsorption on solid surfaces, and other surface effects. The forces are different than in the bulk solid, since you don’t have the interaction from all directions. The lack of symmetry makes for some interesting physics.

Surfaces of the same material can have pretty strong attraction; the adhesion between metal surfaces is called galling 

https://en.m.wikipedia.org/wiki/Galling

(I “discovered” this problem putting some bolts into a frame in a vacuum system and having one seize up. Right after, I was introduced to the anti-seizing compound molybdenum disulfide)

How about if they are not metals, but two different materials?

I know that atoms or molecules near the surface of liquid or water may absorb from or lose its molecules/atoms to the surrounding.

Does it also happen to solid?

When two solids of the same kind or different kinds are touched, pushed, or rubbed against each other, could they exchange their molecules or atoms at the touching surface?

Thanks for the concept.

What will you guy do if you find dead bodies of household pests e.g. roaches, flies, left on your ceramic or stainless steel dish plates? For some reasons I left home so urgently and had no time taking care of the hygiene, and only came back after about a year.

What I can think of now is to first rinse with dish-washing detergent and water and then rinse with boiling water. Anything else I can do more to clean up these dish plates?

Hi everyone else, please read what I am looking for carefully, I am only looking for a tool that will help record what I have done to my files, it is just like an activity log, and there is totally nothing about hacking or spying as slandered by someone with malice in mind.

I mean I'll be able to get a text file that will show the log of any action (e.g. create a new file or folder, cut or copy to paste to a new destination, rename a file or folder, edit or delete a file, etc.), with the corresponding timestamps showing when it was done.

For example, when I create a new file or folder, it is logged, when I delete a file, it is logged, when I edit a file, it is logged, when I rename a file, it is logged, when I cut and move a file, it is logged, when I copy and paste a file, it is logged, anything altered is logged. Of course, the corresponding time is necessary.

It will be great if it can automatically delete the old log after a specified time, e.g. 7 days, 15 days etc.

Log with text is good enough, recording screen is costly, which will take a lot of time to watch and a lot of space to save.

Is there such tool?