Section 1. Purpose. Dangerous gain-of-function research on biological agents and pathogens has the potential to significantly endanger the lives of American citizens. If left unrestricted, its effects ...

For decades, ecologists have puzzled over a mystery: Why do some natural habitats get overrun by invasive species while others seem to repel outside threats? In a classic 1958 book on the subject, the ...

WASHINGTON, July 8 (Reuters) - Scientists have unearthed in Arizona fossils from an assemblage of animals, including North America's oldest-known flying reptile, that reveal a time of transition when ...