"Water, water everywhere, and not a drop to drink," said the Ancient Mariner in Samuel Taylor Coleridge's famous poem. Indeed, we are surrounded by water about 80 percent of Earth's surface is covered by water yet only 2.5 percent is freshwater. Of this freshwater, about 70 percent is frozen in glaciers and permafrost. Therefore, less than one percent of the planet's total water is non-frozen freshwater, most of which consists of groundwater (water stored beneath the Earth's surface).
What’s in a drop? Well, lots. A drop of blood can tell you if you’re sick, a drop of water can ruin your new computer… A drop can do more than you think. And now, a drop of fluid could be enough to run a hundred biochemical tests.