Switzerland has minted a limited edition gold coin less than 3mm in diameter yet big enough to see the face of Albert Einstein sticking out his tongue.
The Jewish physicist’s face now graces the world’s smallest coin weighing 0.063 (1/500th of an ounce) of which only 999 are being made, selling for around £157.
The Swiss Confederation has issued commemorative coins since 1936 to honour important historical and cultural events or great personalities. The coins are designed by Swiss artists.
Other coins commemorate tennis ace Roger Federer, marksman and folk hero
William Tell, and the Barry dog breed, later known as St Bernard, which worked as a mountain rescue dog in the Swiss Alps.