Sunlight: World’s most ancient traveller
Sun, the pivotal element of the solar system, is a middle-aged star that is around 4.6 billion years old. This...
Mercury
Invention of the thermometer
In about 1607, Galileo invented an instrument that could measure the rise of water in a glass tube with the...
Which is the only metal that is liquid at room temperature?
Mercury or quick-silver is a metal which is liquid. It has a very low melting point at minus 38.83 degrees celsius....
