A 2012 article from MIT's Technology Review explored a substance that still has scientists baffled: ice. The article states,

Ice is one of the best studied materials on Earth. It has shaped our planet and plays a crucial role in atmospheric and ocean physics. [Life] as we know it would be impossible without it …. [and] the solar system is filled with it. So you could be forgiven for thinking that science's intense focus on this material has revealed more or less all there is to know about ice—that the problem of ice has been more or less solved …. [but] nothing could be further from the truth.

The article explains that ice is still a complex substance that mystifies researchers—hence the title of the article: "The Mysterious Challenge of Understanding Ice." A group of scientists at the "frontiers of ice research" explain that we still have a remarkable variety of open questions about ice. For example, chemists still don't understand how ice structures form in the first place. Atmospheric physicists would dearly like to know how ice grows in the atmosphere. Questions remain about "snow physics" and "sea ice." Beyond earth, we still don't know much about the ice in ice comets. Scientists also don't know much about the ice that forms on the icy moons of the outer solar system.

Given all these questions to explore, the article concluded that we live in "exciting times for ice research."