The American inventor presented his invention revolutionising telecommunication at New York University in 1837.
The device that transmits human voice as electrical signals was invented by Bell in 1876.
Machines converting the energy of flowing or falling water into useful forms of power were already in use in the Middle Ages.
A widespread snail species, also popular as food.
A mushroom is the fleshy fruiting body of a fungus, made up from hyphae.
Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.
Tectonic plates can move in relation to each other.
The large intestine is the last section of our digestive track.
Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.
RMS Titanic was the largest passenger ship at the beginning of the 20th century.
Carbon is bound in organic substances during photosynthesis, while during breathing, it is released into the atmosphere.
Dry land on the surface of Earth is divided into continents which are separated by oceans.
Combining a conventional internal combustion engine propulsion system with an electric propulsion system reduces emission.
The New Horizons space probe was launched in 2006, with the objective to study Pluto and the Kuiper Belt.
When the Sun, Earth, and the Moon are arranged in a straight line, the Moon can partially or completely obscure the Sun.
This animation demonstrates the structure and operation of CT scanners.
The Doric, Ionic and Corinthian order of columns are different in size and ornamentation as well.
This animation demonstrates the anatomy of spiders through the example of a common European species.
Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.
When producing sound, the vocal cords are vibrated by the air flowing out of the lung.