Today I Learned

[Demystifier]

Or just (allegedly) violating copyright?

If it was violating copyright, youtube would remove the video entirely.

Anyway, the video/audio is beautiful on so many levels ...

 

[Demystifier]

I wonder how long it will take for automated political correctness to ban chess completely.

 

[Keith_McClary]

"Video unavailable" ... plays fine on youtube

There are numerous questions about this or similar issues.

 

[BillTre]

TIL that you can get a waterproof endoscope that plugs into your cell phone for under $12!
See here.

 

[fresh_42]

TIL that you can get a waterproof endoscope that plugs into your cell phone for under $12!
See here.

No, I do not want to imagine what it is intended for ...

 

[BillTre]

No, I do not want to imagine what it is intended for ...

It can be used on car engines too.

 

[fresh_42]

It can be used on car engines too.

Did you recently look under the hood of a modern car? The times when you could repair a v-belt with a pair of nylons are long gone.

 

[BillTre]

Last car I worked on had a carburetor.

 

[berkeman]

TIL that you can get a waterproof endoscope that plugs into your cell phone for under $12!
See here.

Nice! I'm going to see if Amazon has them as well...

 

[BillTre]

I recently got my daughter (a budding field biologist) a wireless microscope take connect with her phone.
It was something like $30 or $40.
Very handy in the field.
Others in her lab group decided to get similar things also.

Another thought I had for the endoscope was looking into animal burrows.
Maybe getting a snake to bite one.

 

[waternohitter]

I recently got my daughter (a budding field biologist) a wireless microscope take connect with her phone.
It was something like $30 or $40.
Very handy in the field.
Others in her lab group decided to get similar things also.

Another thought I had for the endoscope was looking into animal burrows.
Maybe getting a snake to bite one.

Interesting! Where have you bought that thing? I think I need to buy one for me

 

[BillTre]

Interesting! Where have you bought that thing? I think I need to buy one for me

Amazon probably. I'm sure their on ebay too.

 

[WWGD]

I learned that to remove the n right-most (leftmost) characters in an Excel (Workbook) file, where data is stored in column C, we can use:

Edit: LEFT( C:C, LEN(C:C)-N)

For example, to remove the 6 right-most characters ( which is what I did) from column B in a workbook, we use:

LEFT( B:B, LEN(B:B)-6)

Sounds counterintuitive to use LEFT here, but I assume it means the last n characters starting left.

At any rate, I used it to remove units from a file in order to analyze the data; so that the workbook contained only numbers.

Also , learned the leftmost r' used in the pd.read_ function is used to escape the slashes in strings.

Hopefully also finally internalized, after so many years and mistakes, that the 4extension for my files is .xlsx and not .xlsx. Computers are "autistic" .

 

[mfb]

Is that really an "=", not a "-"?

"LEFT" takes the first x characters from the left, if you take LEN(...)-6 characters you get rid of the rightmost 6 characters.

 

[WWGD]

Is that really an "=", not a "-"?

"LEFT" takes the first x characters from the left, if you take LEN(...)-6 characters you get rid of the rightmost 6 characters.

Ah, yes, it is a - , not an =. Let me edit.

 

[Stavros Kiri]

I learned that to remove the n right-most (leftmost) characters in an Excel (Workbook) file, where data is stored in column C, we can use:

Edit: LEFT( C:C, LEN(C:C)-N)

For example, to remove the 6 right-most characters ( which is what I did) from column B in a workbook, we use:

LEFT( B:B, LEN(B:B)-6)

Sounds counterintuitive to use LEFT here, but I assume it means the last n characters starting left.

At any rate, I used it to remove units from a file in order to analyze the data; so that the workbook contained only numbers.

Also , learned the leftmost r' used in the pd.read_ function is used to escape the slashes in strings.

Hopefully also finally internalized, after so many years and mistakes, that the 4extension for my files is .xlsx and not .xlsx. Computers are "autistic" .

See what life is teaching you?! You must feel a lot better now! ...

 

[strangerep]

TIL... the word "braggadocio", after a journalist used the word to describe a recent press conference.

 

[jack action]

TIL the word 'innervate' ... which is not the same as 'enervate'!

 

[Buzz Bloom]

Today I learned two new-to-me facts about chemistry nomenclature.

https://www.physicsforums.com/threads/why-is-hcl-called-hydrogen-chloride-by-iupac-naming.996456/​

Post #8.​

 

[Keith_McClary]

https://www.physicsforums.com/threads/why-is-hcl-called-hydrogen-chloride-by-iupac-naming.996456/
Post #8

Today you learned that you can link directly to the post by using the "Share this post" icon:
https://www.physicsforums.com/threa...chloride-by-iupac-naming.996456/#post-6421961

 

[Drakkith]

Today I learned that as late as the 1970's almost the entire world's supply of light bulbs was produced by just 15 machines scattered across the globe: https://blog.cmog.org/2017/01/27/the-machine-that-lit-up-the-world/

 

[fresh_42]

TIL something about SR which is actually useful here on PF:

Travelling time to Andromeda with 1g acceleration and deceleration (Einstein): 28 years boardtime
Travelling time to Andromeda with 1g acceleration and deceleration without the c constraint (Newton): 2,800 years boardtime
Reason why it won't work either way: CMB will work as resistor and additional energy meant for acceleration will be turned into particle production instead and arbitrarily close to c will be physically impossible, regardless which engine we constructed.

These easy arguments could shortcut many fruitless discussions on space travel.

 

[Astronuc]

This week I learned that carbon dating a fossilized life form is dependent on the diet of the life form.

Carbon from terrestrial plants, and herbivores consumed by carivores/omnivores, has 'younger' carbon than fish in the ocean. People with marine diets have a different proportion of carbon than people eating meat and plants from land.

https://www.pbs.org/wgbh/nova/video/why-did-these-vikings-bones-appear-older-than-they-are/

I actually heard about it on a program related to archeological investigations of peoples in the Arctic region in northern Canada, Greenland, Iceland and Norway. The program was exploring the potential interactions between Norse Vikings and so-called Dorset peoples.

https://en.wikipedia.org/wiki/Dorset_culture
https://www.historymuseum.ca/cmc/exhibitions/archeo/paleoesq/ped01eng.html

 

[BWV]

you can safely disregard anything that comes after the word ‘may’ in a popular science headline

 

[Keith_McClary]

you can safely disregard anything that comes after the word ‘may’ in a popular science headline

And anything ending in "?".

 

[Stavros Kiri]

CMB

+ also perhaps cosmic radiation (wherever in space it exists), scattered particles, small rocks and interstellar dust etc. ...
In other words, not an empty space, as we would ideally imagine ... Thus it would require very advanced 'Shields' ... (with such velocities) etc.

 

[jtbell]

Today I learned about the world's first underwater roundabout. It's at the junction of a Y-shaped undersea tunnel which will open later this month in the Faroe Islands. You can read about it (with map and pictures) in English and in Faroese.

 

[Jarvis323]

I learned that (according a study) our "stuff" (not including our trash) now outweighs all life on Earth. And apparently our plastic stuff alone outweighs all animal life on Earth.

https://www.nature.com/articles/s41...45_deeplink_PID100044684&utm_content=deeplink

 

[BillTre]

I learned that (according a study) our "stuff" (not including our trash) now outweighs all life on Earth. And apparently our plastic stuff alone outweighs all animal life on Earth.

https://www.nature.com/articles/s41...45_deeplink_PID100044684&utm_content=deeplink

Here is a Science mag news article on this.

 

[BillTre]

TIL there are fun barcodes:

 

[BillTre]

TIL that:
Pandemic lockdown has lead to more people gardening in Britain.
More people digging around in their gardens has new archeological discoveries.

Gardeners in Hampshire, a county in southeast England, were weeding their yard in April when they found 63 gold coins and one silver coin from King Henry VIII’s reign in the 16th century, with four of the coins inscribed with the initials of the king’s wives Catherine of Aragon, Anne Boleyn and Jane Seymour.

The archaeological find was one of more than 47,000 in England and Wales that were reported this year, amid an increase in backyard gardening during Coronavirus lockdowns, the British Museum said on Wednesday.

 

[Ibix]

TIL there are fun barcodes:
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View attachment 274124

View attachment 274125

View attachment 274126

When my son was little we had a story book about a chameleon, one of those cardboard ones with wheels and flaps, so the chameleon changed colour. The last page had a wheel embeddedin it, and the back cover had the barcode with a chameleon-shaped cutout above. When you turned the wheel the chameleon would shift from green to having barcode stripes.

 

[fresh_42]

When my son was little we had a story book about a chameleon, one of those cardboard ones with wheels and flaps, so the chameleon changed colour. The last page had a wheel embeddedin it, and the back cover had the barcode with a chameleon-shaped cutout above. When you turned the wheel the chameleon would shift from green to having barcode stripes.

What you did not know: It also changed while in store from £ 7.95 to £ 14.95.

 

[mfb]

Today I learned about the world's first underwater roundabout. It's at the junction of a Y-shaped undersea tunnel which will open later this month in the Faroe Islands. You can read about it (with map and pictures) in English and in Faroese.

To illustrate the use of the tunnel:

 

[dlgoff]

Today I learned about the world's first underwater roundabout.