Biology
Get flash to fully experience Pearltrees
Animals
Humans
Origins
Databases
The Breathing Earth simulation Welcome to Breathing Earth . This real-time simulation displays the CO2 emissions of every country in the world, as well as their birth and death rates. Please remember that this is just a simulation. Although the CO2 emission, birth rate and death rate data used in Breathing Earth comes from reputable sources, data that measures things on such a massive scale can never be 100% accurate. Please note however that the CO2 emission levels shown here are much more likely to be too low than they are to be too high.
Breathingearth - CO2, birth & death rates by country, simulated real-time
The Whale Hunt / A storytelling experiment / by Jonathan Harris
You have to agree that it is impressive in a way, seeing as they are not wasteful and put almost every part of the whale to good use. Then again, they can't afford to be wasteful, unlike other civilizations today. by Feb 20
DNA is extracted from human cells for a variety of reasons. With a pure sample of DNA you can test a newborn for a genetic disease, analyze forensic evidence, or study a gene involved in cancer. Try this virtual laboratory to perform a cheek swab and extract DNA from human cells. PCR is a relatively simple and inexpensive tool that you can use to focus in on a segment of DNA and copy it billions of times over. PCR is used every day to diagnose diseases, identify bacteria and viruses, match criminals to crime scenes, and in many other ways. Step up to the virtual lab bench and see how it works!
Learn.Genetics™
Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification.