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The Crow are Native Americans who inhabited the Yellowstone River valley.
An ant colony consist of a queen, male ants and workers.
To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
A two-stroke engine is a type of internal combustion engine with a cycle of only two...
Cosmopolitan monocots inhabiting watersides.
The apple is one of the most popular fruits around the world.
The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.
Paper was invented more than two thousand years ago.
Polypeptide chains are composed of amino acids and can appear in alpha-helix or...
Oil tankers appeared in the late 19th century; today they are among the largest ships.
This animation shows optical and radiotelescopes used in astronomical observation
Triglycerides containing unsaturated fatty acids are liquid at room temperature.
Observatories are often built at high elevations to minimise the effects of atmospheric...
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
Three saturated fatty acid molecules linked to a glycerol molecule.
Modern Slavs live in 14 European countries that can be classified into 3 groups.
A hot air balloon is a balloon aircraft which is lifted by hot air.
Water turbines convert the kinetic energy of water into electric current.
One of the most important monocot crops.
Regular dice can be used for solving statistical and probability exercises.