PLEASE NOTE:

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

 
MemeMan
 
Comments: 72
Article views: 818
 
 
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.
 

Read News24’s Comments Policy

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
Add your comment
Comment 0 characters remaining

Read more from our Users

Submitted by
Irvin Whitecomb
Why are our fuel prices so high?

Can someone please explain why the petrol price is so high if the price of oil has dropped by over half of what it cost. Read more...

31 comments 2867 views
Submitted by
Prenisha Naidoo
I will be proactive...

This letter is in response to articles on the death of baby Jamie Naidoo, We have the tendency to be reactive…we wait for something to happen, then suddenly we care, writes a News24 User. Read more...

0 comments 148 views
Submitted by
Christelle Delport
Transcendence

I recently watched the movie, Transcendence, and I once again realized how far people will go to deny or destroy that what they don’t understand. Read more...

19 comments 1095 views
Submitted by
Nunu
Ban Hunting Now!

This is far too emotional an issue, it should be dealt with realistically. There are risks to conservation if hunting is banned ... like it or not. Read more...

19 comments 1864 views
Submitted by
Brian Faul
The reality of a failed state

Hook line and sinker. That about sums it up for South Africa. We have been caught by the oldest trick in the book.  Read more...

7 comments 642 views
Submitted by
Andre Joubert
The Groenewald family I know

 Read more...

20 comments 482 views

Jobs in Cape Town [change area]

Property [change area]

Travel - Look, Book, Go!

Kalahari.com - shop online today

2DAYS ONLY – 30% off Appliances

Coffee makers, blenders, fans, juicers and more. T&Cs apply. Shop now!

2 DAYS ONLY – 40% off books

Get 40% off when you buy 2 books. For two days only! T&Cs apply. Buy now!

Up to 50% off on outdoor gear

Save on chairs, blankets, cooler bags, umbrellas and more. Shop now!

Save on Samsung

Cameras, mobile phones, TVs, Tablets and more. While stocks last. Shop now!

Grand Theft Auto 5

Now available on PS4, Xbox One and PC from R649. Buy now!

OLX Free Classifieds [change area]

Samsung Galaxy s4

Mobile, Cell Phones in South Africa, Western Cape, Cape Town. Date October 24

Best bargain in big bay

Real Estate, Houses - Apartments for Sale in South Africa, Western Cape, Cape Town. Date October 25

VW Golf 6, 1.6 Trendline (Excellent condition)

Vehicles, Cars in South Africa, Western Cape, Cape Town. Date October 25

 

services

E-mail Alerts The latest headlines in your inbox

RSS feeds News delivered really simply.

Mobile News24 on your mobile or PDA

E-mail Newsletters You choose what you want

News24 on your iPhone Get News24 headlines on your iPhone.

SMS Alerts Get breaking news stories via SMS.

Blogs Your opinion on you, me and everyone.

Calais Website keywords automated by OpenCalais.

 
Interactive Advertising Bureau
 
© 2014 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.