Anónimo

Over the past few decades, a handful of scientists have been racing to explain a disturbing aspect of our universe: only four percent of it consists of the matter that makes up you, me, our books, and every star and planet. The rest is completely unknown. Richard Panek tells the dramatic story of the quest to find this “dark” matter and an even more bizarre substance called “dark energy”. This is perhaps the greatest mystery in all of science, and solving it will bring fame, funding, and certainly a Nobel Prize.

Crossing the Grand Canyon rim to rim is considered by many hikers and runners to be one of the greatest “bucket-list” achievements. Thousands make the pilgrimage each year to experience the joy of journeying across the Canyon's great expanse. Anyone who descends into the canyon should take time to learn about the history of the trails they use.