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Non-orientable surfaces
The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one side.
Conic sections
The conic section is a plane curve that is created when a right circular cone is intersected by a plane.
Meteorological instruments
This animation demonstrates instruments used to examine atmospheric phenomena.
RT-2PM Topol Intercontinental ballistic missile (Soviet Union, 1985)
A mobile, nuclear-capable ballistic missile developed at the end of the Cold War.
Tidal power station
Tidal power stations utilise the daily fluctuation of the water level for producing electricity.
Cube of cubes
An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.
Thermal power station (hydrocarbon fuel)
Thermal power stations convert energy released during the combustion of fossil fuels or renewable resources into electricity.
Sphere
A sphere is the set of points which are all within the same distance from a given point in space.
Native American settlement (Crow Nation)
The Crow are Native Americans who inhabited the Yellowstone River valley.
Thermal expansion of bridges
The length of the metal frameworks of bridges change when the temperature changes.
Attack of Pearl Harbor (1941)
The United States entered World War II after the devastating attack by the Japanese navy.
Geothermal power station
Geothermal power stations convert energy of hot, high-pressure water found in deeper layers of the Earth into electricity.
Thyroid gland
An important endocrine gland producing hormones that affect metabolism and the calcium balance of the body.
Cylindrical solids
This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.
