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, ...

You've probably heard of the ‘butterfly effect’ from the 2004 American sci-fi movie featuring young Ashton Kutcher. But the term stems from the branch of math called chaos theory and is actually ...

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 ...

The world’s butterflies are under intense pressure from habitat destruction and other environmental threats, with many populations dwindling rapidly and others vanishing before our eyes. One recent ...