Encapsulated Stainless Steel

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 10:38:44 AM. © CR4 - Recent Forum Threads and Blog Entries

Question Can stainless steel be encapsulted in fiberglass ? I have heard comments to the extent that stainless needs to breath ??...

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Vacuum condition check of vacuum tower

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 10:30:36 AM. © CR4 - Recent Forum Threads and Blog Entries

Dear All Please advice how to perform any on situ check of vacuum conditions of vacuum tower. Mean how is possible to check if all the connecti...

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Checking Vacuum Conditions in Vacuum Towers

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 10:30:36 AM. © CR4 - Recent Forum Threads and Blog Entries

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Who Installs Rooftop Solar Systems in France and
Spain

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 10:27:13 AM. © CR4 - Recent Forum Threads and Blog Entries

Hello Peoples , I'd like to know where could I find people who design and install solar power station in the France and Spain ? is there some p...

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e-and-Spain?from_rss=1

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Urgent know information designer of Pv Power
station on the roof of the house .

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 10:27:13 AM. © CR4 - Recent Forum Threads and Blog Entries

Hello Peoples , I'd like to know where could I find people who design and install solar power station in the France and Spain ? is there some p...

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r-station-on-the-roof-of-the-house?from_rss=1

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Why does a platypus lay eggs anyway

post from Fish Feet on 03 May 2007 10:23:35 AM. © Fish Feet

Children are taught many ?rules of thumb? to help them identify animals, for example: mammals, are hairy, give birth to live young, make milk and take care of their children. So why does the hairy platypus lay eggs? The discovery of this bizarre, egg-laying, duck-billed, web-footed mammal initially baffled naturalists, but now we understand them much better because we know much more about their special place in the tree of evolution.

All animals on Earth are related, even though these relationships aren?t always obvious. The reason these relationships are hard to figure out is that despite the diversity of animals we see, they represent a mere fraction of the life that has ever existed on this planet. In fact, one famous palaeontologist estimated that we know of less then 1% of the Earth?s diversity through time.

To understand the relationships between animals better, we have to look back in time, at the extinct ancestors of the animals alive today (animals living today are called ?extant?).

This diagram (called a cladogram) shows how the five major groups of vertebrate animals are related:
-Fish gave rise to the first amphibians, which crawled on to land about 400 million years ago.
-Amphibians and reptiles share a common ancestor about 350 million years ago.
-Mammals and birds evolved from reptiles much later at different times during the Mesozoic Era.

Each of these major transitions was slow. It must be understood that a fish doesn?t become an amphibian overnight. There were many different species of animals that formed that transitory stages between these groups and possessed a unique set of characteristics, a sort of ?mosaic? between the two groups.

Now let?s look more closely at the evolution of mammals. Mammals evolved from mammal-like-reptiles, a very diverse groups of animals which are all (unfortunately) extinct. Through time three major groups of mammals evolved:
Protherians - which lay eggs (eg. platypuses and echidnas)
Metatherians - which let young develop in pouches (marsupials such as kangaroos and koalas)
Eutherians ? ?modern mammals? which give birth to well-developed offspring (this includes many familiar species such as rabbits, elephants, horses, and humans)

The platypus is a protherian. This ancient group branched off of the mammal tree of life early on before the other two groups. There are many different protherians in the fossil record but only platypuses and echidnas are still around. So the past there was a great diversity of egg-laying mammals, but sadly, all of those animals except for platypuses and echidnas) are now extinct.

If you are interested in this topic I recommend visiting Date A Clade, which has an excellent (and more comprehensive) cladogram with detailed information on when major groups of animals split away from each other.Sarda Sahney of the University of Bristol writes Fish Feet, a science blog about biodiversity, conservation, palaeontology, evolution and current controversies. Recent topics include the frilled shark, living fossils, white tigers, polar bears who hunt beluga whales and the world's largest dinosaur

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Lets make it clear

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 10:14:12 AM. © CR4 - Recent Forum Threads and Blog Entries

Is glass a liquid or a solid?

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Is Glass a Liquid or Solid

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 10:14:12 AM. © CR4 - Recent Forum Threads and Blog Entries

Is glass a liquid or a solid?

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Today is the National Day of Reason

post from Living the Scientific Life (Scientist, Interrupted) on 03 May 2007 09:59:54 AM. © Living the Scientific Life (Scientist, Interrupted)

tags: day of reason, religion, secular hnumanist, politics

In response to the federally-supported National Day of Prayer, which is an abuse of the constitution, a group of nontheists and traditional religious allies who value the separation of church and state, have declared today the National Day of Reason. This day is being observed on the first Thursday of May, which is the National Day of Prayer.

Read the rest of this post... | Read the comments on this post...

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he_national_day_of_r.php

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Hitachi E64HRP PLC Handbook Needed

post from CR4 - Recent Forum Threads and Blog Entries on 03 May 2007 09:15:37 AM. © CR4 - Recent Forum Threads and Blog Entries

Hi: We are looking for programmers handbook of HITACHI PLC model E64HRP. Can anyone tell us where to download ? regards

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