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He used statistical techniques to reconcile these differences and provide estimates for bonobo populations across the entire range of Salonga, including areas previously unstudied.

Until now, groundwater -- a critical water resource around the globe, especially in dry regions -- has been largely unstudied in its importance and role in sustaining ecosystems.

But environmental campaigners say the deep seabed is the last frontier in the planet that remains largely unstudied and untouched by humanity and mining there could cause irreparable damage, no matter how pressing the need.

Then there is the un-collared and unstudied male mountain lion that has been elusively and peacefully coexisting with humans in the area for at least 10 years.

Ultimately, the impact of long-term use of these supplements, especially in adolescents, is unstudied.