Why do cats purr
It is generally believed that purring cats is a sign of their good mood. However, this is not…
Colored snow
Have you seen colored snow: yellow, green, red or even black? One of the causes of unusual rainfall…
The largest indoor plants
Today, anyone can imagine himself as a gardener, and grow his own garden even in an apartment. The…
Thunder and thunderstorm
What is the phenomenon of thunder and thunderstorm and where do they come from? Is there thunder without…
What is the minimum temperature a person can withstand?
The question of What is the minimum temperature a person can withstand – is the subject of many…
Airplane flight: efficiency and optimal altitude
Investigating the airplane flight: efficiency and optimal altitude at which they can perform best. At what height do…