ScienceMag» from the Web
The Jack Hills in Western Australia contain rare relics of Earth's early history—tiny zircon crystals that formed more than 4 billion years ago. Now, scientists say these crystals may also hold important clues about the history of life.
Mexico, North America, United States
For the first time in 4 years, scientists have seen an uptick in the number of monarch butterflies migrating from the United States to Mexico.