During the last ice age, which route was taken by the first humans to reach the Americas, and did they travel by foot, boat or both? Humans first arrived in North America at least 15,500 years ago. Exactly how they got there, however, constitutes one of the longest-standing debates inContinue Reading

The animal might use spines on its throat to recognize potential mates instead of calls A newfound species of frog doesn’t ribbit. In fact, it doesn’t make any sound at all. Many frogs have unusual characteristics, from turning translucent to being clumsy jumpers. The recently discovered amphibian lacks a voice.Continue Reading