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Today I learned, that Picasso, after watched the cave paintings said "In 15 thousands years, we have invented nothing" Can't help but remember Aristotle claim. Aristotle: Earth is the center of the universe Early Astronomy: Milky way center is the center of the universe. Hubble (law): Earth...

Oh. Thank you :smile:

Today (yesterday, actually) I learned that YouTube (or Google?) is more scarier than it looks. Just when I'm searching on Google to see what is Appendix F in Challenger disaster report. Then later when I opened my phone, not the computer, Youtube suggested this: Just how the h*ll that they...

I'm sorry. 4GB can't be odd number: 4294967295, I think it's 4294967296. It's just the largest value that I remember. I'm a computer programmer myself.

Yeah, tell that to the computer seller. For Harddisk and file size. 1 Kb is sometimes 1000 bytes or 1024 bytes. And sometimes 1 Mb is 1000 * 1024 bytes, sometimes it's 1024 * 1024 bytes. For RAM module and flash disk. 1 Kb is exactly 1024 bytes. 1 Mb is exactly 1048576 bytes. And 1 Gb is...

Thank you very much for your reply @pbuk

Add: And the first to carry a civilian.

Yes, Challenger disaster was very sadly and also traumatic. It's been watch by relatives, all the Christa's students and exploded. Not like Columbia. Which Leroy (the Flight Director) realized something was wrong between 15 minutes of comm black out. And everytime I watch Youtube footage about...

Ahh, the imperial system. Haven't thought of that. Well, metric was introduced right after Lavoisier lost his head I think.

Yeah, everytime I see Richard Feynman, I can't shake off @PeterDonis signature. Nature can't be fooled. Challenger investigation?

Thanks Ibix

Thanks Peter

Yes, Lavoisier, sadly. La République n'a pas besoin de savants ni de chimistes.

Today I learned, that the definition of the speed of light is 299,792,458 meter per second. Not that speed of light that I learned. But that the definitions was settled in 1983. What the hell?? Why didn't they set the speed of light is 300,000,000.000000 meter per second exactly, and let the...

Dear PF Forum, It's been a while since I logged in here. And I really do appreciate all the answers that I've been getting here. Now, I wonder. Is there any standardization for 1 light year distance? Is it 10 trillion kilometers, or 299,792,458 * 60 * 60 * 24 * 365.256 = ...

Summary: Curious to find out genetic code other than DNA <mentor> Moved to Discussion, hypothetical discussion Dear PF Forum, It's been a long time since I log into PF. And I hope everybody is in a good health. Recently I had a discussion debate with my friend about other life in this...

Thank you very much @JimJCW

Today I learned that the Earth was (ever) tidally locked to one of our (Indonesian) satellite? https://en.wikipedia.org/wiki/Garuda_1 Leave it to Lockheed Martin to construct such a powerful satellite. Too bad they don't build F22 anymore after so many were destroyed by Godzilla and Ironman.

Today I learned, actually a few years ago, as a computer programmer that... You can type. Create Database DataSet Read Text Trace Date Feed all with your left hand. While for me, when I was wearing the cast. popup link lookup loop are the worst.

So..., What was the size of the observable universe at Baryogenesis epoch? And what was its size during Photon (380 thousands years) epoch?

Thanks for all responses. I really appreciate it.

Yess..., the observable universe. I miss that word. I just realized the day after I post this question. Thank you very much.

Dear PF Forum, I've been searching what was the size of the early univese, but I think I might have hit the wall. I read that in the end of inflationary epoch, 10-32 seconds, the size of the universe was as big as a grape fruit? And after that, it seems that I can't find a reference to the size...

Today I learned, why aliens never visit us. Forget about Fermi paradox, Filter, Goldilocks, etc... When I try to see if there's some discussion about cosmology from an enginner view as opposed to a scientist view (not that I regard Bill Nye is not a scientist). And I type Bill Nye Degrasse...

Today I learned that LHC costs ten billions dollars! LHC is the biggest machine on Earth to study the smalest thing in the universe?? Phew... Those scientists, they really know how to spend money, eh. :smile:

Today I learned watched that what "Theory of Everything" means is the combining of the four forces. - Gravity - Electromagnetism - Strong force - Weak Force I mean, I've known this four forces years ago, and I've heard about this TOE, but just yesterday I leaned that it's the combination of the...

Wow, Sir. You are a real historian.

Today I learned that U 235 is not a German Uboat

Ow, thanks SSequence.

I'm sorry. Penrose number (1010123) question should be Is it A: 1 followed by 246 1230 zeros or B: 1 followed by... you know. I think there's a bug in my ALU or typo (if you call it a typo) in option A, but considering option B, my ALU just simply crashes.

Dear PF Forum, I watched this video 10 ^ 10 ^ 10 ^ 5600 The narative says, It is 1 followed by 5600 zeros But that's not what I think, I think it is 1 followed by I don't know. What does this number means? Is it A: 10 ^ (10 ^ (10 ^ 56))) or B: ((10 ^ 10) ^ 10) ^ 56? It says that "As...

I think I have one other question (many actually, but it's the only one that I can think of). When Alice measure her electron it spins up. What happens when Alice measure her electron again some times later? Considering that Bob does not do anything, and nobody tampering with Alice electron...

Thank you, thank you very much Perok

Dear PF Forum, I've been having this question for a long time. I want to know how or what is measurement. Supposed there are two observers. Alice and Bob, They are separated 10 light minutes away. They are in the same frame of reference, meaning that their distance is the same all the time...

I think this is after the OP question. Because I just watch this video and looking explanation in PF Forum.

Now, now. It would be 300000000/0.000000590 = 508 Thz :smile:, not 590nm But, I understand your answer Thank you sir :smile:

Dear PF Forum, My friend asked me this afternoon, why primary colors are Red, Green, Blue. Well, I just answered it's because our receptor cells in the retina. The L,S,M. But something is bothering me now. Does our brain "translate" the color from our retina? Supposed we see two lights from red...

I recently watch Genius on NatGeo, It's season 1: Einstein. I think I spot a few mistakes there. 1. When this astronomer, Freudlund, if I spell correctly, says "The orbit of Mercury is not like the orbit of seven other planets" Now, Pluto is not a planet since 2006 if I'm not mistaken. Since...

Thank you very much every body.

Thanks Baluncore, it's the certifying that I'm trying to find out.

Wow, thank you. I'll check it.

Dear PF Forum, Can someone help me with the algorithm for finding a very large prime number? In RSA Encryption (1024 bit? 2048?, I forget, should look it up at wiki for that), Private Keys is a - two prime number packet. Now, what I wonder is, what algorithm that the computer use to find those...