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Carl Sagan famously said, “Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a Universe in which there are far more galaxies than people.” Our crossword today features the latest theories from top physicists about the Universe.

A quote apocryphally attributed to Henry Ford goes, “If I had asked people what they wanted, they would have said faster horses.” Our crossword this week covers recent critical innovations and the debate as to whether they will be beneficial or detrimental to mankind’s survival.

Stephen Hawking once said, “I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.” This crossword explores the global energy problem and its potential solutions.

The title is a quote from William Carlos Williams. Oceans are the focus of this crossword puzzle. They form over 70% of Earth’s surface, and about 97% of Earth’s water can be found in them. Yet, in various ways, man is threatening this incredible ecosystem.

The title of this crossword is a quote from Plutarch. In this puzzle, we include many of the diverse beliefs of mankind and touch on many attempts to explain life and its meaning. Can the human spirit prevail over the barriers to survival? Are the barriers locked inside the mind itself?

The title of this crossword is taken from a quote by Sally Ride, the first American woman in space. In this crossword, we go back to the time when we first realized the Earth went around the Sun and not vice versa, and we look toward future explorations, such as the hunt to find dark matter. There’s no question that the Universe around us will always fascinate the human race.

Over thousands of years, a few men and women have had groundbreaking ideas that changed the course of history. Many others have contributed to modernizing civilization. This crossword features some of them.

First, he conquered flight. Then he started to conquer space. Pioneers who had no fear led the way into the unknown.

Discoveries and innovations constantly lead man forward into new realms. But thoughts can take many forms. Can man direct his own thoughts to raise the level of his civilization?

Many of the clues are based on content that you can read on Big Think. Good luck!

Many of the clues are based on content that you can read on Big Think. Good luck!

Welcome to the inaugural Big Think crossword puzzle! Each week, we will feature a new crossword, and many of the clues will be based on content that you can read on Big Think. Good luck!