European trade goods (thanks to Nebraska Game and Parks Division) North American people made rapid scientific advances in the course of the 1500s AD, inspired by contacts with traders and [...]
Snow in Afghanistan Afghanistan West Asia is a dry place, where it's always hard to get enough water and there are a lot of fights over water. The easternmost part [...]
History of Dysentery: Dysentery came from germs in your drinking water. Here people are washing clothes in the river (India) What is dysentery? Dysentery means having trouble with your insides [...]
Aqueduct in the city of Rome - Roman aqueducts brought clean water to the people of Rome Why did the Romans build aqueducts? As Roman towns got bigger under the Roman [...]
Stratus clouds (thanks to NASA) What are stratus clouds? If you see stratus clouds, that's the time to get inside and stay there. Stratus clouds mean rain if it is warm and snow if it [...]
Cumulonimbus clouds are a type of nimbus cloud What is a nimbus cloud? Nimbus clouds often mean that a thunder storm is brewing: there may soon be thunder and lightning. Get out of [...]
A cloudy glass of water You can see for yourself that blue light scatters more than red light. This is the same way that John Tyndall showed why the sky was [...]
See the steam coming out of this kettle? You can make your own clouds and see how they work. Just take a tea kettle and fill it full of water and put it on [...]
These are cumulus clouds. They are puffy. What is a cumulus cloud? Cumulus clouds are clouds that are piled up on top of each other. "Cumulus" means a pile in Latin, as in [...]
Clouds in the sky. What are clouds? Clouds are made of water What are clouds? Clouds are made of drops of water or ice. When the wind picks up water from the ocean or from [...]
