We've spent billions searching for dark matter and still haven't found it. Why are scientists obsessed with finding something they can't see? | BBC Sky at Night Magazine
In 2007, scientists used NASA satellite measurements to reveal 14 areas of moving water beneath West Antarctica; one hidden lake had drained about 2 cubic kilometres in three years
In 2011, scientists injected yellow-green fluorescein dye into Maui’s wastewater wells; 84 days later, it appeared near the Pacific, supporting an underground wastewater connection