A moistened thread is easier to pass through the eye of a needle. Ingredient in an improvised a builder's level. Medium for diluted medicins, weed-killers, fertilisers, dyes, paints, electrolytes, etc. Medium for washing clothes, our bodies and most things. Essential to modern plumbing. Lubricant for some functions. Means of travel. Medium for art - as in fountains and some modern musical instruments. Medium for sport, as in swimming, surfing, water polo, kayaking, sailing, fishing etc. Medium for boiling or steaming food. Essential for growth of plants, including natural fibres and all our food. Cause of erosion in many landscapes; one of the forces that shapes land and geography. Without it no humidity, rain, snow or ice - no rivers, lakes, seas, swamps, bays or oceans. 99% of the weight of the bodies of many life-forms, including our own. Without it, no life.
It can be also used to cut through steel like a laser....and a Dam good way of making free Electricty free of charge :) And it also heliourerious at Barf night at the comedy store ....:)