You're ignorant of most things, and recognizing this is one of the most important things to growth as a person.
this post was submitted on 29 Feb 2024
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I honestly have no idea what your first paragraph is about. It might as well be in Chinese.
I'm a molecular biologist. I was recently surprised when I told someone that RNA is a thing that all living thing are brimming with. He thought that RNA was something scientists invented in 2020s to use as COVID vaccines.
I also once worked with someone who had a degree in biological sciences and was shocked to learn that female cows have vaginas. She didn't explain where she thought baby cows come from, but we decided not to push the matter and changed the subject.
Wow... I was pretty shocked at the levels of ignorance with vaccines in recent history too.
ELI5 of certificates:
The "s" in "https" in urls like "https://wikipedia.com" stands for "Secure".
When you connect to Wikipedia's computer to read something, how do you know if the content you get back is what they actually sent and wasn't altered by your friendly neighborhood hacker?
Wikipedia can "sign" the content before sending it you. They also give you a certificate telling you how they have a particular signature which has been verified by someone else whom you already trust, and how long this particular signature is valid for.
If a hacker tries to alter the document returned by Wikipedia, they wouldn't be able to sign the document correctly. If they tried to give a certificate with a different signature too, you would catch it because they wouldn't be able to fake the verification of the "someone you trust" so you'd catch the fake certificate.
Browsers handle all this stuff for us. If it detects something fishy, it'll just show an error along the lines of "could not verify certificate". In some cases, it's genuinely an issue where you/the website is under attack and you may get a virus.
In some other cases though, it's an issue of the certificate expiring and the guys at Wikipedia not being proactive about getting a new signature and certificate. If you are ABSOLUTELY CERTAIN that you're just dealing with a lazy developer and not a malicious hacker, you can tell your browser to ignore whatever issue it detected and show you the content that was returned by Wikipedia.
Thanks for attending my TEDx talk.
you probably don't know how to do a valve check on the car you drive every day
I know how to do a valve check.. I probably should on my car. I did the valves on my motorbike. That was a real mission.
I know how, but I'm not messing with it. I have a Volvo 5 cylinder. It has plugs in the cam girdle (it doesn't have a valve cover, the upper cover is also the upper half of the cam races) you pull the plugs and check the clearance. Then you do a calculation and order new lifters from the dealer. It's not making noise, so I don't care enough to check it.
don't lie to me steven
How do the shims stay in place?
magnets
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