Solids, liquids and gases. In a solid like this brick, the particles are regularly arranged touching their neighbours and move only by vibrating. This explains why solids have a fixed shape. In a ...

Elisa Oviedo transforms water from liquid to solid. Elisa Oviedo and her niece change water from liquid to solid using a freezer. Then they heat water up on the stove until it turns into gas. Elisa ...

Nigel Pereira on two inventions that seem to be mind-boggling as they seem to change the natural state of the resource in question. With deforestation and the burning of fossil fuels now widely ...