Plastics are made from natural materials such as wood, coal and oil. They can also be changed into synthetic materials with different properties. Plastic can be thin and transparent or thick and ...
A compilation of clips set to background music and based on the theme of solids, liquids and gases. It includes ice, steam, clouds, exhaust fumes, flour, molten glass, steam produced by a train, a ...
Professor Richard Fortey investigates the reproductive cycle of crabs. The moulting process is where the female sheds her exoskeleton by releasing enzymes that digest the shell and then, through ...