The most difficult language to learn is Basque, which is spoken in northwestern Spain and southwestern France. It is not related to any other language in the world. It has an extremely complicated word structure and vocabulary.
Dogs can't distinguish between red and green.
All babies are colour blind at birth.
Although our nose and ears keep growing throughout our lives, our eyes remain the same size from birth.
The cornea is the only tissue in the human body which doesn't contain blood vessels.
Your eyes become tired when you read or stare at a computer, this is because you blink less often.
An ostrich's eye is bigger than its brain.
Out of all the muscles in your body, the muscles that control your eyes are the most active.
Each of your eyes has a small blind spot in the back of the retina where the optic nerve attaches. You don't notice the hole in your vision because your eyes work together to fill in each other's blind spot.
Some people are born with two differently colored eyes. This condition is heterochromia.
Newborns don't produce tears. They make crying sounds, but the tears don't start flowing until they are about 4-13 weeks old.
One ounce of pure gold could be hammered into a single sheet nine metres square.
The 40,000 miners who joined the California Gold Rush in 1849 were called '49ers'. Only a very few ever got rich.
High purity metallic gold is odorless and tasteless. This makes sense, since the metal is unreactive. Metal ions are what confers flavor and odor to metallic elements and compounds.
Julius Caesar gave two hundred gold coins to each of his soldiers from the spoils of war in defeating Gaul.
The element symbol for gold is Au. The symbol comes from the old Latin name for gold, aurum, which means "shining dawn" or "glow of sunrise". The word "gold" comes from the Germanic languages, originating from the Proto-Germanic gul and Proto-Indo-European ghel, meaning "yellow/green". The pure element has been known since ancient times.
Gold is extremely ductile. A single ounce of gold (about 28 grams) can be stretched into a gold thread 5 miles (8 kilometers) long. Gold threads can even be used as embroidery thread.
The largest gold coin ever minted, a 2007 Canadian $1,000,000 Maple Leaf is 53cm in diameter.
In 95 BC, Chinese Emperor Hsiao Wu I minted gold commemorative piece to celebrate the sighting of a unicorn.
Nearly all of the gold on Earth came from meteorites that bombarded the planet over 200 million years after it formed.
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