Life is ubiquitous on Earth and appears in a diversity of forms. But what characteristics do organisms have? What makes them alive? This activity explores that question. In the first part of the ...

The life cycle of a butterfly worksheet is a great way for kids to learn about metamorphosis in a hands-on way. From egg to caterpillar, chrysalis to butterfly, this transformation is one of ...

Researchers at Harvard University have created polymer-based, cell-like structures capable of self-reproducing—one of the most fundamental characteristics of life. The system does not use any of ...

Brian Resnick was Vox’s science and health editor and is the co-creator of Unexplainable, Vox’s podcast about unanswered questions in science. We know life when we see it. Flying birds are ...