4th dimension (4d): A simple explanation that you can understand

I came across this video from a Reddit post. This video is less than 10 minutes long and the explanation on 4th dimension given by Carl Sagan is very simple and easy to understand.









Link:

Youtube: Carl Sagan 4th Dimension Explanation
Carl Sagan Biography
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At the same sea level, which latitude on earth do you weight lower?

I came across this question from the bonus question section of Jeopardy show.

The is question is:
At the same sea level, which latitude on earth will give you a lower weight?

To find out the answer, highlight this post either by dragging the mouse over the whole page or press "ctrl" and "a" at the same time.

At equator, or zero degree.

If your curious mind want to know why, go to "Ask an Astronomer" to find out!


Link:

Ask an Astronomer
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Vision simulator- How do things look to people with colorblindness or cataracts?

Have you ever wondered how do things look to those with colorblindness? There is a flash program that allows a person without colorblind defect to view things through the eyes of those with colorblind.

And if you are colorblind, two pictures will look similar to you, but not the same. This is due to the fact that in order to simulate colorblindness for the normal vision people, certain colors from the normal photo has to be digitally altered to the effect.

In other words, for normal vision people, "normal" photo is the full color photo. Each "colorblind" photo is associated with color deficiency as associated with the colorblind people. To stimulate the deficiency effect for normal vision people, the corresponding color has to be altered from the "normal" photo.

For colorblind people, you will get a much vibrant "normal" photo when compared to the one that is associated with your color deficiency. This is because the color deficiency photo loses some of the color that you cannot associate with, rendering it less vibrant.

Vision simulator

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Colorblindness Testing

To test if you have colorblind, you can use this simple test available on the same website. It is very effective, and you can know the results right away. If you suspect yourself as colorblind, you might want to get medically proven by going to the doctor.
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Philosophy, Physics, Mathematics - Dangerous Knowledge (BBC Documentary)

Here is a very interesting documentary by BBC (British Broadcasting Corporation) on the lifework/achievement of four famous philosophers, physicians, and mathematicians:

Georg Ferdinand Ludwig Philip Cantor
Ludwig Eduard Boltzmann
Kurt Godel
Alan Turing





Link:

Google Video
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JPL Nasa - Climate Time Machine (interactive)


If you are interested to know what are the changes to the Artic Sea Ice level since 1979 to 2007, Global CO2 (carbon dioxide) Emissions from 1980 to 2004, Average Global Temperature since 1885 to 2007 or what will happen to your country/city if the Sea Level rises from 0m to 6m, head over to the interactive Climate Time Machine by JPL (Jet Propulsion Lab) to learn about it.

You will realize that global warming is indeed happening and not a hoax!

Climate Time Machine
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