Producing speech requires the synchronized operation of several cortical centers.
The least tightly packed crystal structure.
The conic section is a plane curve that is created when a right circular cone is intersected by a plane.
Wind power stations convert the kinetic energy of the wind into electricity.
This animation demonstrates instruments used to examine atmospheric phenomena.
Keeps were typical buildings in the Middle Ages, also built independently from castles.
Electric current can be generated by rotating an armature loop in a magnetic field.
This animation demonstrates how an escalator works.
Colorless, odorless liquid produced by dissolving carbon dioxide in water.
Metals forming hexagonal metallic lattices are rigid and difficult to machine.
A group of fish characterized by a cartilaginous skeleton, well-known species include the great white shark and the hammerhead shark.
Enzymes are protein molecules catalyzing biochemical reactions. Their activity can be regulated.
The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.
Scoliosis is a medical condition in which a person's spine has a lateral deviation.
Trolleybuses and streetcars are environment-friendly means of public transportation
Spanish conquerors owed their success to their armor and firearms.
The name of the Russian armored cruiser became well known during the October Revolution of 1917.
Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
English sailing ships were among the best ships in the 17th-19th centuries.