The five most popular stories on CNN.com in the past 24 hours, according to NewsPulse.

Hole on plane forces Southwest flight to land: Southwest Airlines announced Saturday that it is grounding 81 planes for inspection following an incident in which one of its flights was forced to make an emergency landing after a 3-foot hole tore open in the fuselage of the plane.

Radioactive water leaks from Japan nuke plant: A first attempt to plug a cracked concrete shaft that is leaking highly radioactive water into the ocean off Japan failed Saturday, so officials are now exploring alternatives, spokesmen for Tokyo Electric Power Co. said.

Kate and William: Private moments revealed? It's a scene few would witness - the sight of a scantily clad, soon-to-be-royal Kate Middleton serving Britain's Prince William breakfast in bed. FULL STORY

Protests erupt after Quran burning in U.S.: The deadly protests in northern Afghanistan over a Quran burning spread to the country's war-torn southern region on Saturday, with provincial government officials reporting at least nine civilians dead and dozens injured.

Ryan budget targets Medicaid, Medicare: House Budget Chairman Paul Ryan, R-Wisconsin, will unveil a highly anticipated 2012 Republican budget next week that proposes dramatic changes to political lightning rods: entitlements.