For example, a 24” hula hoop with 13 plants means 13 x 13,872 and an average population of 180,336. Some field guides will also provide tables with the math already completed for these and ...

"We were surprised that an activity as popular, fun, and healthy as hula hooping wasn't understood even at a basic physics level," says Ristroph. "As we made progress on the research, we realized ...