Misc: In 1758 Wilhelm---------- , discoverer of asteroids Pallas and Vesta, born. ?

Questions

What geyser erupts every hour at yellowstone national park?

What gift was given on the 10th day, according to "The 12 Days of Christmas?

What gland washes the eyes?

What goes with ruby, emerald and sapphire to make up the world's most valuable gems?

What greek phrase means 'the masses'?