Humans were present in North America 10,000 years earlier than previously thought, according to a new study. Researchers from the University of Arizona have analysed fossilised footprints found at ...
Something very strange appears to be happening deep, deep underneath the U.S. Midwest and the Ohio Valley. North America’s geological core has persisted for more than a billion years; it’s what ...
1. Introduction to mussels and mussel ecology -- 2. Catching the mussel bug : a history of the study of mussel ecology in North America -- 3. Diversity and biogeography -- 4. Aquatic habitats and ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback