It's a Treehugger's dream come true. Leafsnap is a free app that identifies plant species of all kinds, from flowers and bark to fruit and trees. Go for a walk, take a shot of a leaf, and this little ...

Ever wonder why males and females of the same species can sometimes look radically different from each other? It's all thanks to a condition known as sexual dimorphism, which is generally triggered by ...

Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives.