While humans possess three kinds of color-sensitive cones, birds have four. This is an Inside Science story. Hummingbirds can see colors humans can only imagine, an ability that now sheds light on an ...

A ring-shaped molecule may possess a cavity because of its three-dimensional structure. This cavity can accommodate a guest molecule if its size (configuration) is adequate for the cavity, while it ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...