Thought Provoking Graphs

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Grammatron
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Re: Thought Provoking Graphs

Post by Grammatron » Tue Jul 30, 2019 4:05 am

Abdul Alhazred wrote:
Tue Jul 30, 2019 1:20 am
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When you put it that way it makes Baltimore look bad.

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Doctor X
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Re: Thought Provoking Graphs

Post by Doctor X » Tue Jul 30, 2019 4:14 am

Image

even the White Chick agrees, Gram:

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:freedom:

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Witness
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Re: Thought Provoking Graphs

Post by Witness » Sat Aug 10, 2019 3:45 am

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Witness
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Re: Thought Provoking Graphs

Post by Witness » Sat Aug 17, 2019 1:07 am


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Abdul Alhazred
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Re: Thought Provoking Graphs

Post by Abdul Alhazred » Wed Aug 21, 2019 1:19 am

Image
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No big surprises, but I do find it interesting that partisan divide is wider without there being much change in underlying opinion.
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Abdul Alhazred
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Re: Thought Provoking Graphs

Post by Abdul Alhazred » Fri Aug 23, 2019 11:58 pm

Image
Image "If I turn in a sicko, will I get a reward?"

"Yes! A BIG REWARD!" ====> Click here to turn in a sicko
The arc of the moral universe bends towards chaos.
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Giz
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Re: Thought Provoking Graphs

Post by Giz » Sun Aug 25, 2019 1:51 pm

Interesting that a blue whale only goes to 350 feet. Whale sharks have gone to 6000 iirc (and great whites to 4000).

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Abdul Alhazred
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Re: Thought Provoking Graphs

Post by Abdul Alhazred » Sun Aug 25, 2019 3:22 pm

Blue whales feed on plankton, thus no reason to go below where light penetrates.

No food for them in the inky abyss.
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Re: Thought Provoking Graphs

Post by Witness » Mon Aug 26, 2019 2:48 am

Image
https://i.imgur.com/kNeHb0g.jpg to get to the enlargeable original.

Such a peaceful region! :P

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Witness
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Re: Thought Provoking Graphs

Post by Witness » Mon Aug 26, 2019 2:55 am

Giz wrote:
Sun Aug 25, 2019 1:51 pm
Interesting that a blue whale only goes to 350 feet. Whale sharks have gone to 6000 iirc (and great whites to 4000).
Well, don't forget that mammals have to get back to the surface from time to time. :wink: (And can also suffer from decompression sickness.)

You're correct about the sharks. Some links:
https://www.livescience.com/55216-deepe ... harks.html (Whale sharks are also filter feeders, so it's unclear why they dive so deep.)
https://www.whoi.edu/oceanus/feature/th ... st-divers/
https://www.newscientist.com/article/dn ... ish-squid/

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Anaxagoras
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Re: Thought Provoking Graphs

Post by Anaxagoras » Mon Aug 26, 2019 11:27 am

Giz wrote:
Sun Aug 25, 2019 1:51 pm
Interesting that a blue whale only goes to 350 feet. Whale sharks have gone to 6000 iirc (and great whites to 4000).
Sperm whales apparently go much deeper according to Wikipedia. 7,382 ft deep. For an animal that breathes air, that's impressive. It also says that Cuvier's beaked whale dives even deeper than that. 9816 ft. Sharks don't need to breathe air but there may be other reasons why they don't go any deeper.

https://en.wikipedia.org/wiki/Sperm_whale
https://en.wikipedia.org/wiki/Cuvier%27s_beaked_whale
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ed
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Re: Thought Provoking Graphs

Post by ed » Mon Aug 26, 2019 11:57 am

Witness wrote:
Mon Aug 26, 2019 2:55 am
(And can also suffer from decompression sickness.)

Not if you are holding your breath
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shuize
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Re: Thought Provoking Graphs

Post by shuize » Mon Aug 26, 2019 10:27 pm

Giz wrote:
Sun Aug 25, 2019 1:51 pm
Interesting that a blue whale only goes to 350 feet. Whale sharks have gone to 6000 iirc (and great whites to 4000).

So too sperm whales.* An internet search says they have been tracked as deep as 7,380 feet.

A few more that surprised me: Emperor penguins have reportedly been tracked to 1,755 feet, leatherback turtles tracked to 4,200 feet and, amazingly, elephant seals to 7,835! As posted above, cuvier’s beaked whales, which I'd never heard of, to 9,874 feet.

As an aside, I was snorkeling in Okinawa yesterday (unfortunately unable to dive due to a scheduled flight). The water was very clear and I was able to watch divers below. They weren’t really very deep, maybe around 15 meters (which is close to the limit for the entry level scuba license) and as I was watching them it struck me how deep that seemed from the surface.

It’s funny, I’ve been down to around 40 meters on a couple of occasions and while that is nothing on the surface, it’s really damn deep for recreational scuba diving. It’s almost impossible for me to wrap my mind around the depths posted above.


https://scubadiverlife.com/top-five-dee ... g-animals/


* That name always makes me laugh.

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Witness
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Re: Thought Provoking Graphs

Post by Witness » Mon Aug 26, 2019 11:46 pm

ed wrote:
Mon Aug 26, 2019 11:57 am
Witness wrote:
Mon Aug 26, 2019 2:55 am
(And can also suffer from decompression sickness.)

Not if you are holding your breath
If you had the Internet in Florida you could have googled it. :roll:


Even Sperm Whales Get the Bends
Do Whales Suffer From Decompression Sickness?

Extreme diving of beaked whales

SUMMARY

Sound-and-orientation recording tags (DTAGs) were used to study 10 beaked whales of two poorly known species, Ziphius cavirostris (Zc) and Mesoplodon densirostris (Md). Acoustic behaviour in the deep foraging dives performed by both species (Zc: 28 dives by seven individuals; Md: 16 dives by three individuals) shows that they hunt by echolocation in deep water between 222 and 1885 m, attempting to capture about 30 prey/dive. This food source is so deep that the average foraging dives were deeper (Zc: 1070 m; Md: 835 m) and longer (Zc: 58 min; Md: 47 min) than reported for any other air-breathing species. A series of shallower dives, containing no indications of foraging, followed most deep foraging dives. The average interval between deep foraging dives was 63 min for Zc and 92 min for Md. This long an interval may be required for beaked whales to recover from an oxygen debt accrued in the deep foraging dives, which last about twice the estimated aerobic dive limit. Recent reports of gas emboli in beaked whales stranded during naval sonar exercises have led to the hypothesis that their deep-diving may make them especially vulnerable to decompression. Using current models of breath-hold diving, we infer that their natural diving behaviour is inconsistent with known problems of acute nitrogen supersaturation and embolism. If the assumptions of these models are correct for beaked whales, then possible decompression problems are more likely to result from an abnormal behavioural response to sonar.
https://jeb.biologists.org/content/209/21/4238

However, mass strandings of whales in places like the Canary Islands forced scientists back to the drawing board, as autopsies revealed some of the creatures had gas bubbles in their tissues that suggested decompression sickness.

The discoveries suggested that while rare, it was actually possible for the animals to get the bends. Moreover, scientists suspected that naval activity in the area was somehow involved in this process.
https://www.independent.co.uk/news/scie ... 20466.html

Do Whales Get the Bends?

Whales may be able to get the same decompression sickness that scuba divers do when they surface too quickly from a dive, despite their adaptations to a life in the ocean.
https://www.nationalgeographic.com/news ... -sickness/


TL; DR: probably yes, they can get the bends, but convincing autopsies need very fresh cadavers. Normally they have coping mechanisms, but they aren't perfect (damage can accumulate) especially if the animal makes an emergency dash for the surface.

shuize
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Re: Thought Provoking Graphs

Post by shuize » Tue Aug 27, 2019 2:35 am

Dive medicine is well beyond my limited brain power. But I seem to recall reading it is technically possibility for free divers to get DCS and that possibility goes up if free diving post-scuba.

* ETA: A quick internet search suggests free diving alone would require fairly deep, repetative free dives to build up the nitrogen load to cause DCS. However, post-scuba free diving is playing with fire.

https://www.scubaboard.com/community/th ... -dcs.8619/

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Witness
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Re: Thought Provoking Graphs

Post by Witness » Wed Aug 28, 2019 3:06 am

Image
13.136 cities of the world, colored by elevation – size by population
https://old.reddit.com/r/dataisbeautifu ... elevation/

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robinson
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Re: Thought Provoking Graphs

Post by robinson » Wed Aug 28, 2019 9:08 am

Since India, China and Japan are the oldest civilizations, it makes sense they would have the most cities, and the most people. Also, it sucks to live way up north.
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Re: Thought Provoking Graphs

Post by Anaxagoras » Wed Aug 28, 2019 9:55 am

The Mercator projection kinda gives an exaggerated sense of the size of the north.
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Abdul Alhazred
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Re: Thought Provoking Graphs

Post by Abdul Alhazred » Wed Aug 28, 2019 1:22 pm

Anaxagoras wrote:
Wed Aug 28, 2019 9:55 am
The Mercator projection kinda gives an exaggerated sense of the size of the north.
North enough for that to matter isn't city territory anyway.
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The arc of the moral universe bends towards chaos.
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Rob Lister
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Re: Thought Provoking Graphs

Post by Rob Lister » Wed Aug 28, 2019 2:06 pm

Anaxagoras wrote:
Wed Aug 28, 2019 9:55 am
The Mercator projection kinda gives an exaggerated sense of the size of the north.
Yea, if the Panama Canal was in Canada, it would be 100 miles wide. No way we could dig that. :|