Some animals are so rare they’ve only been seen once, leaving behind a single record and a trail of unanswered questions. This video explores five creatures documented in isolated sightings, then ...

Like most vertebrates, humans only have one heart, which is usually located near the front and middle of the chest, slightly to the left of the breastbone. The heart’s primary function is to pump ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. When we think about the scope of our world’s diversity, ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Blue blood may look alien, but it’s one of evolution’s most ...