Add Yahoo as a preferred source to see more of our stories on Google. Jun. 10—If you think you've been seeing an invasion of helicopters this year, you're not imagining things. Southern Minnesota ...

When wind or other disturbances detach winged maple seeds called samaras from their parent tree, they spin through the air—and can even spin when it's raining. Impacts by high-speed raindrops only ...

PASADENA, Calif.—The twirling seeds of maple trees spin like miniature helicopters as they fall to the ground. Because the seeds descend slowly as they swirl, they can be carried aloft by the wind and ...

You may have noticed lots of those helicopter maple tree seeds filling up rain gutters or piling up on the sidewalk this year. State Forester Tivon Feeley says the large amount of seeds created a ...

COLLEGE PARK, Md.—Maple tree seeds (or samara fruit) and the spiraling pattern in which they glide to the ground have delighted children for ages and perplexed engineers for decades. Now aerospace ...

Like helicoptering maple seeds, tiny new fliers whirl gracefully as they glide. The miniature aircraft, which can be made as small as a grain of sand, could be dispersed by air over long distances.

Add Yahoo as a preferred source to see more of our stories on Google. Winged seeds called samaras grow on maple trees. These are seeds from the Japanese maple, _Acer palmatum_. AlessandroZocc/iStock ...

Jun. 10—If you think you've been seeing an invasion of helicopters this year, you're not imagining things. Southern Minnesota maple trees are producing a copious amount of seeds that flutter from ...