The famous theoretical physicist, Albert Einstein, has had a massive influence on science, despite being born 140 years ago. His theory of relativity provides the basis of modern physics, while his algebraic formula, E=MC², recognising the link between mass and energy, is known as the “world’s most famous equation”.

The world’s first adhesive postage stamp, the Penny Black, was launched in Britain in May 1840. It depicted a dignified profile picture of Queen Victoria and received its name because of its colour and its face value of one penny.

Sister and brother duo The Carpenters became one of America’s top musical groups of the 20th century. Their total record sales surpassed more than 100 million and they were one of the top ten best-selling artists in the world at their peak.

The invention of postage stamps in the 19th century marked an important milestone in the history of the postal service. Before stamps were invented, only the wealthy could afford to send letters through the post and it was the recipient, not the sender who had to pay the fee.

The king of rock and roll, Elvis Presley, first sang in church as a child, making his public debut at the age of ten at the Mississippi–Alabama Fair and Dairy Show’s talent contest. Although he didn’t win, he was inspired to pursue a musical career and went on to become one of the most iconic artists in history.