Today I Learned

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SUMMARY

This discussion revolves around the concept of daily learning, where participants share various facts and insights they have recently discovered. Key topics include the woodworking technique "oyster veneering," the mathematical fact that 23! equals 25,852,016,738,884,976,640,000, and the medical terms "hyperacusis" and "diplacusis." Participants also touch on humorous observations about life, such as the impact of television on weight and the emotional sensitivity of Barn Owls.

PREREQUISITES
  • Understanding of basic mathematical concepts, specifically factorials.
  • Familiarity with woodworking techniques, particularly historical methods like oyster veneering.
  • Knowledge of medical terminology related to hearing, such as hyperacusis and diplacusis.
  • Awareness of cultural references, including the significance of historical events and figures like Muhammad Ali.
NEXT STEPS
  • Research the historical context and revival of oyster veneering in woodworking.
  • Explore advanced mathematical concepts related to factorials and their applications.
  • Investigate the medical conditions hyperacusis and diplacusis, including their causes and treatments.
  • Learn about the emotional behaviors of animals, particularly Barn Owls and their sensitivity.
USEFUL FOR

This discussion is beneficial for woodworking enthusiasts, mathematicians, medical professionals, and animal behaviorists, as well as anyone interested in the quirky facts of daily life.

  • #2,611
Drakkith said:
I have a few things I learned recently in Kerbal Space Program during a mission to send a bunch of probes to Jool (Jupiter analog in-game). This one is too long to post here, but I made a post on the KSP reddit page here:
For Joules and Joules... the ups and downs of my adventure to Jool

Title is a reference to Alan Shepard saying his golf ball went "miles and miles and miles" on the Moon, it obviously rhymes with Jool, and it's a reference to the fact that rockets require energy to function. Triple play!
Great story! :woot:
 
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  • #2,612
Today I learned that the maximum time you can possibly survive after crossing the event horizon of a non-rotating uncharged black hole is about ##15M_{BH}/M_{Sun}## microseconds. (https://arxiv.org/abs/0705.1029, equation 18).
 
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  • #2,613
Ibix said:
Today I learned that the maximum time you can possibly survive after crossing the event horizon of a non-rotating uncharged black hole is about ##15M_{BH}/M_{Sun}## microseconds. (https://arxiv.org/abs/0705.1029, equation 18).
That's an entire minute in ours! And on whose clock?
 
  • #2,614
Ibix said:
Today I learned that the maximum time you can possibly survive after crossing the event horizon of a non-rotating uncharged black hole is about ##15M_{BH}/M_{Sun}## milliseconds. (https://arxiv.org/abs/0705.1029, equation 18).
Today (well, not exactly) I learned another rule of survival, the realistic one: Only 3 necessary "addiction elements" for all humans, and in the proper order of survival "approximate golden rule" to be followed (most of the time): "~3+ min without oxygen, ~3+ days without water, 30+ days without food ..."

[Sorry guys! This does not mention coffee, alcohol, smoking or any other addiction for that matter ... . Time to give up ... :-p:biggrin::nb)]
 
  • #2,615
Today I learned some things are just creepy...

 
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  • #2,616
fresh_42 said:
That's an entire minute in ours! And on whose clock?
Hours in the largest black holes we know.
On your clock, of course.
 
  • #2,617
fresh_42 said:
That's an entire minute in ours!
By "ours", I take it you mean Sagittarius A*? Yes. Although that has spin, so this isn't strictly applicable.
fresh_42 said:
And on whose clock?
That's your own time (your so-called proper time) as you fall in, timing from when you cross the event horizon. I'm not sure there's a non-ambiguous way to talk about this period on anyone else's clock, black holes being what they are.

As noted, it's a maximum limit, and neglects the fact that you'll be torn apart by tidal forces at some point before then, even with a supermassive black hole.
 
  • #2,618
TIL that the President of Nigeria, Muhammadu Buhari, felt he had to deny that he was a human clone of himself.
There is a conspiracy theory that he had died last year and was replaced by a clone of himself (or another person from Sudan).
 
  • #2,619
CWatters said:
Today I learned some things are just creepy...



Now that is what I would call art!

When we get to a level of technology when we are able to upload consciousness, I would totally trust this artist with my 3d representation.
 
  • #2,620
Stavros Kiri said:
"~3+ min without oxygen, ~3+ days without water, 30+ days without food ..."
~3 hours without an internet connection.
 
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  • #2,621
DaveC426913 said:
~3 hours without an internet connection.
Why don't they just shoot us instead? ...
 
  • #2,622
Craftek_Ana said:
Now that is what I would call art!

When we get to a level of technology when we are able to upload consciousness, I would totally trust this artist with my 3d representation.
Android there we come! ...
 
  • #2,623
BillTre said:
TIL that the President of Nigeria, Muhammadu Buhari, felt he had to deny that he was a human clone of himself.
There is a conspiracy theory that he had died last year and was replaced by a clone of himself (or another person from Sudan).
Just to quash the scurrilous rumors that have been circulating in certain quarters, I too deny that I am a clone of myself...
 
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  • #2,624
Mark44 said:
Just to quash the scurrilous rumors that have been circulating in certain quarters, I too deny that I am a clone of myself...
Now that you mention it, me too!
 
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  • #2,625
Mark44 said:
Just to quash the scurrilous rumors that have been circulating in certain quarters, I too deny that I am a clone of myself...
I can neither confirm nor deny that I am a clone of myself.
 
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  • #2,626
DrGreg said:
I can neither confirm nor deny that I am a clone of myself.
Neither can I.
 
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  • #2,627
DrGreg said:
I can neither confirm or deny that I am a clone of myself.
DrGreg said:
Neither can I.
Is that a double profile? Get him! ...
 
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  • #2,628
Stavros Kiri said:
Is that a double profile?
No, single profile, with multiple personalities.
 
  • #2,629
Mark44 said:
No, single profile, with multiple personalities.
Or confused clones [using the same account] ...
 
  • #2,631
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  • #2,632
Drakkith said:
for burn due to water-skis on fire.
Wood, or fiber glass?
 
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  • #2,633
Mark44 said:
Just to quash the scurrilous rumors that have been circulating in certain quarters, I too deny that I am a clone of myself...
The question is, what does Mark43 have to say about it?
 
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  • #2,634
Drakkith said:
Today I learned there is an ICD-10 code (International Statistical Classification of Diseases) for burn due to water-skis on fire.
https://www.icd10data.com/ICD10CM/Codes/V00-Y99/V90-V94/V91-/V91.07XA
See also http://www.icd10forpt.com/17-super-specific-super-bizarre-icd-10-codes/

Of note:

Z63.1 Problems with the in-laws
V97.33XD Sucked into jet engine, subsequent encounter
W56.22xA Struck by orca, initial encounter
V61.6XXD Passenger in heavy transport vehicle injured in collision with pedal cycle in traffic accident, subsequent encounter
R46.1 Bizarre personal appearance
 
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  • #2,635
Bystander said:
Wood, or fiber glass?
And initial water temperature 20.435°C or 20.44°C ? These are the big issues that need to be categorized! How else one can sleep at night?
 
  • #2,636
Ibix said:
The question is, what does Mark43 have to say about it?
He's missing (broke loose)
 
  • #2,637
Ibix said:
See also http://www.icd10forpt.com/17-super-specific-super-bizarre-icd-10-codes/

Of note:

Z63.1 Problems with the in-laws
V97.33XD Sucked into jet engine, subsequent encounter
W56.22xA Struck by orca, initial encounter
V61.6XXD Passenger in heavy transport vehicle injured in collision with pedal cycle in traffic accident, subsequent encounter
R46.1 Bizarre personal appearance
BBT found an example for "We don't have a code for ..."
 
  • #2,638
fresh_42 said:
BBT found an example for "We don't have a code for ..."
Well, doesn't that have a code?
 
  • #2,639
TIL that Mars is about 3 light minutes away from us at its closest approach
 
  • #2,640
TIL what TIL means ...
 

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