PLEASE NOTE:

MyNews24 is a user-generated section of News24.com. The stories here come from users.

 
MemeMan
 
Comments: 72
Article views: 854
 
 
Latest Badges:



 
View all MemeMan's badges.
 

You – Are a Failed Fish

22 August 2013, 07:16

A while back, in an essay entitled “The Fossils Are in Your Head”, I explored our distant fish ancestor’s emergence from the water 365-million years ago.  I described how gills became the things of the throat; adenoids, pharynx, larynx (causing the looping of the Recurrent Laryngeal Vagus Nerve from the brain, under the heart aorta in the chest, and back up to the throat), and also the transition of swim bladders into terrestrial lungs.

Along a similar track:

This evening, listening to Doctor Karl’s Podcast, at 29minutes 22 seconds, a caller to the show posed a question, the answer to which I thought was quite intriguing – so I thought to share it.

The question involved ocean fish – why every other creature needs to drink fresh water, but ocean fish don’t.

The answer was quite intriguing:

Ocean fish have kidneys that work overtime – filtering out all the salt, sustaining the fish with water.  Makes sense.

Meanwhile – all land dwellers are “fish gone wrong” – because, as the Doc puts it, you will be pleased to hear: “God made a mistake”.

He went on to explain how human kidneys will filter in a day about 200 to 250kg’s of blood – that’s a ¼ of a ton of blood – and will extract from it around 1,5kg’s of salt – which is a vast amount – the equivalent amount “as if we were still in the ocean(!!)” – and then, because we are no longer in the ocean, it puts it back, save for 80-thousanths of 1 gram which goes out in the urine.

The whole process is a huge metabolic cost; but we do it because that is the way the kidneys set up originally and there has been no evolutionary pressure to change it.

His parting words resonate: “Evolution doesn’t have to be perfect, it just has to be good enough”.

 ***

Oh… and the next caller’s dog had just come back from being de-sexed at the vet, but turned out to be a hermaphrodite – or, more correctly, ‘intersex – and he goes on to talk about Joan of Ark actually being a man who was intersex.

You gotta listen to Doc Karl (and The Naked Scientists) – brilliant stuff.

Disclaimer: All articles and letters published on MyNews24 have been independently written by members of News24's community. The views of users published on News24 are therefore their own and do not necessarily represent the views of News24. News24 editors also reserve the right to edit or delete any and all comments received.

 

24.com publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.

Comment on this story
72 comments
Comments have been closed for this article.

Read more from our Users

Submitted by
Mark Duffield
City of Joburg - a law unto thems...

The City of Joburg is incompetent, egotistical, lazy, disrespectful of our Constitution and the rule of law. Most definitely not “in it” to serve and help their customers. Read more...

0 comments 3114 views
Submitted by
Mlibazisi Jeffrey
Las Vegas and Mogadishu: lessons ...

Intellectually open people know that terror has no race. Yet terrorism has been used to demonise and “other” Muslims and people of a particular look. Read more...

0 comments 179 views
Submitted by
Yj Draiman
Israel must build at least 100k h...

All the territory west of the Jordan River and more belongs to the State of Israel, based on historical data, international law and agreements. Read more...

0 comments 413 views
Submitted by
Siavosh Hosseini
Trump decertifying Iran could be ...

The Iranian regime is finding itself in a position of fighting for its very survival as the international community and the Iranian people call the regime to account.  Read more...

0 comments 292 views
Submitted by
DRUM Digital
SEE: People react to #Brickz sent...

Kwaito star and convicted rapist Sipho 'Brickz' Ndlovu has been sentenced to 15 years in prison for the rape of a 17 year old relative. See how social media reacted. Read more...

0 comments 2935 views
Submitted by
DRUM Digital
SEE: Social media reacts to Zuma'...

President Jacob Zuma has done another cabinet reshuffle. See how social media reacted. Read more...

0 comments 1145 views
 

services

RSS feeds News delivered really simply.

E-mail Newsletters You choose what you want

News24 on Android Get the latest from News24 on your Android device.

SMS Alerts Get breaking news stories via SMS.

 
Interactive Advertising Bureau
 
© 2017 24.com. All rights reserved.
There are new stories on the homepage. Click here to see them.
 
English
Afrikaans
isiZulu

Hello 

Create Profile

Creating your profile will enable you to submit photos and stories to get published on News24.


Please provide a username for your profile page:

This username must be unique, cannot be edited and will be used in the URL to your profile page across the entire 24.com network.

Settings

Location Settings

News24 allows you to edit the display of certain components based on a location. If you wish to personalise the page based on your preferences, please select a location for each component and click "Submit" in order for the changes to take affect.




Facebook Sign-In

Hi News addict,

Join the News24 Community to be involved in breaking the news.

Log in with Facebook to comment and personalise news, weather and listings.