BENGALURU: Brightly coloured hoops going round and round, staying afloat by the sheer rhythmic movements of someone’s waist ...

To keep a Hula-Hoop aloft, it helps to be in shape — literally. Experiments with gyrating, hoop-slinging robots have revealed how these spinning rings stay up despite the pull of gravity.

for example. Built-in motors caused the shapes to gyrate much like a person's hips while using a hula hoop. Then Ristroph et al. launched six-inch mini hoops onto the shapes, filming the resulting ...

The factor represents how many hoops fit in one acre and can be found in field guides, such as Purdue’s. For example, a 24” hula hoop with 13 plants means 13 x 13,872 and an average population ...