A group of tigers is known as an 'ambush' or 'streak'. | During his entire life, Vincent Van Gogh sold exactly one painting, Red Vineyard at Arles. | In a lifetime, an average human produces 10,000 gallons of saliva. | It is believed that Ancient Egyptians used complex mathematics such as algebra, arithmetic and geometry as far back as 3000 BC. | On the ground, a group of geese is a gaggle, in the sky it is a skein.