A monarch butterfly (Dannaux plexippus) flaps its wings in Piedra Herrada Sanctuary, Mexico. Might this start a chain of events that results in a tornado in Texas? Photograph by Jaime Rojo In 1961, ...

Is the 2004 Ashton Kutcher vehicle The Butterfly Effect a good movie? Definitely not, no—but try telling that to me at age thirteen. And then wrap your head, once more, around the fact that if you had ...

For the first time, engineers have created a model that flies just like a real butterfly. Powered only by an elastic band, it flits up and down and flaps its wings languidly – just like the ...

Your support goes further this holiday season. When you buy an annual membership or give a one-time contribution, we’ll give a membership to someone who can’t afford access. It’s a simple way for you ...

In April 2019, an image supposedly showing an "endangered starry butterfly" was widely circulated on social media. One post from the Facebook page Earth Wonders, for instance, racked up more than ...

If a butterfly flaps its wings in China today, it may cause a tornado in America next week. Most of you will be familiar with this “Butterfly Effect” that is frequently used to illustrate a typical ...