Natural Science and Mathematics

This portal is all about natural science and math. You can check out the sub portals mathematics and statistics, physics, chemistry, biology, geography as well as astronomy and space:


Computer Science, Geography and Human Sciences

For topics on computer science, see the portal Programming and Computer Science, for humanities topics refer to the portal Art, Culture, People, Politics and Society

Other scientific topics such as geography, weather, environment and ecology, can be found in the portal Nature, Environment, Animals and Plants.

New Topics

Total Lunar Eclipses in Germany - Dates
In some days, it will happen again: a rare spectacle will take place at the sky and we are able to observe a lunar eclipse in...
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When will there be the next total solar eclipse in Germany?
I would like to know when we may experience the next total solar eclipse in the sky of Germany. An event that I would like to...
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What are Sulfides?
Unfortunately, I can not find an easy-to-understand description of sulfides. We will write a paper next week and I need a good...
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Explanation: Exothermic and Endothermic Reaction
Today, we have learned about exothermic and endothermic reactions in school. Unfortunately, I do not understand this topic! :(...
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Examples for Exothermic and Endothermic Reactions
Our chemistry teacher wants us to put together some examples of exothermic and endothermic chemical reactions over the...
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Local Gravity on the Moon
Everybody knows since the sixth grade that the mean local gravity (gravitational acceleration) on earth is 9.81 m/s² (...
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New Answers and Comments

Binomial Coefficient: Unfortunately, I have to disappoint you. At least for Germany, you have to wait a bit longer for that. The next dates for a total solar...
Question | When will there be the next total solar eclipse in Germany?
Chematik: Sulfides are salts or other derived substances from hydrogen sulfide (H2S). Salts are chemical compounds made up of...
Question | What are Sulfides?
Chematik: Here is an explanation of exothermic and...
Question | Explanation: Exothermic and Endothermic Reaction
Chematik: In an exothermic reaction, energy is released to the environment, in an endothermic reaction, energy is absorbed from the environment....
Question | Examples for Exothermic and Endothermic Reactions
Science5000: The local gravity respectively location factor on the surface of the moon is 1.62 m/s². This makes the same object about six times lighter...
Question | Local Gravity on the Moon
Square: 1 day = 86400 seconds The calculation is quite simple: 1 day consists of 24 hours, each of these hours consists of 60 minutes...
Question | How many seconds does a day have?

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