Two meshing gears transmit torque during their rotational motion.
Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.
This animation demonstrates the structure and most important peripherals of desktop computers.
The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.
An ant colony consist of a queen, male ants and workers.
The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.
Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.
Regular dice can be used for solving statistical and probability exercises.
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.
This animation demonstrates the main sources of soil pollution.
Domesticated animals and crops originate from various parts of the world.
The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.
To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
The Crow are Native Americans who inhabited the Yellowstone River valley.
A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.
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.
Glands of the endocrine system secrete hormones into the blood.