The fourth hour of Strange Days on Planet Earth examines the evidence that pollutants are being spread throughout the world's water systems and explores what we can do to remedy the problem.

Beyond its iconic height, the Redwood Forest is sacred to the Yurok Tribe and a scientific frontier for the study of vast biodiversity that exists nowhere else on Earth. This episode of Untold ...

Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3,959 miles, Earth is the ...