The Senate’s top watchdog on government waste, in a new report Thursday, said taxpayer money has gone to fund such programs as Jell-O wrestling at the South Pole, testing shrimp’s exercise ability on a treadmill and a laundry-folding robot, all funded by the National Science Foundation.

Sen. Tom Coburn, Oklahoma Republican, said he identified more than $3 billion in mismanagement at NSF, ranging from questionable studies to exorbitant operating costs, and in some cases duplication by the science agency of operations performed by other agencies.

At a time when the federal government is struggling with record deficits and bumping up against its borrowing limit, Mr. Coburn said the agency is a prime example of the kinds of spending taxpayers should no longer tolerate.

“There is little, if any, obvious scientific benefit to some NSF projects, such as a YouTube rap video, a review of event ticket prices on stubhub.com, a ‘robot hoedown and rodeo,’ or a virtual recreation of the 1964/65 New York World’s Fair,â€