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Water turbines convert the kinetic energy of water into electric current.
The United States entered World War II after the devastating attack by the Japanese navy.
Division of space by three intersecting planes in several different arrangements.
To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
A hot air balloon is a balloon aircraft which is lifted by hot air.
Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.
Two meshing gears transmit torque during their rotational motion.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
Surface epithelia cover the external and internal surfaces of the body
The reproductive system consists of organs which work together for the purpose of reproduction.
Triglycerides containing unsaturated fatty acids are liquid at room temperature.
Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.
This animation demonstrates the anatomy of birds through the example of mallards.
Regular dice can be used for solving statistical and probability exercises.
A type of snake with a characteristic spot on its neck.
Domesticated animals and crops originate from various parts of the world.
The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.
A game to practise the use of analogue and digital clocks.
The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.
The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.