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In this lesson you can learn about infrared radiation.
This lesson introduces the position and anatomy of the heart, as well as the blood flow and heart sounds.
This lesson introduces the properties of air.
When does echo form? Why does sound spread easier at night? What is the secret to a good concert hall?
This lesson explains the concept of atmospheric pressure.
Learn about the properties of materials that objects around us are made of.
This lesson presents some types of cardiovascular diseases, including their diagnoses and treatment options.
This lesson explains the phases, the internal structure and surface of the Moon, as well as its effects on the Earth.
Kako bismo vam pružili najbolje korisničko iskustvo, na našoj se web stranici koriste kolačići.