Despite satellites and submersibles, most of the ocean is still a question mark. Scientists have theories, but plenty of things under the sea just don’t add up.

Where did all the water come from? Water, water everywhere. It covers 70 percent of Earth’s surface and earns it the nickname “the blue planet.” And yet… where did it come from? How is it so abundant ...

Add Yahoo as a preferred source to see more of our stories on Google. The world is filled with ancient unexplained mysteries that capture the imagination, challenging scientists, scholars, and ...