Apollo 15 astronauts collected tiny green glass beads from the Moon in 1971; more than 35 years later scientists found evidence of water inside, changing what we knew about the lunar interior
Trees are connected by fungal threads beneath the soil, trading carbon and chemical signals in ways scientists are still arguing over — including whether a dying tree can pass part of itself into the forest before it goes
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