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Republicans meeting in Florida will officially nominate Mitt Romney as their presidential nominee Tuesday. The convention gets into full swing after a day of weather delays. The platform committee says final approval of the document will come this afternoon.

NASA Rover Curiosity has been making history since it descended onto the surface of the Red Planet. At a news conference Monday, the rover made history again when it broadcast from the surface of Mars. NASA sent a data file of the recording up to the rover, and then beamed it back down.

Almost seven years after Katrina slammed into New Orleans, Gulf Coast residents are evacuating some areas in anticipation of Hurricane Isaac. NPR correspondents Christopher Joyce and Debbie Elliot, New Orleans Health Commissioner Karen DeSalvo and resident Gwen Thompkins talk about preparing.

Melissa Block talks to Louisiana shrimp boat captain Acy Cooper about how he's preparing for Hurricane Isaac.

While many voters complain that modern political conventions offer little more than over-scripted political theater, most nominating conventions provide a handful of moments to remember. NPR's Political Junkie Ken Rudin takes a look back at highlights from political conventions throughout history.

Florida Sen. Marco Rubio will introduce Mitt Romney on the final night of the Republican National Convention. He may have provided a preview of his speech on Tuesday, explaining how he expects national perceptions of Romney to change this week.

Miami may bring to mind images of the sea and palm trees, but according to park advocates, it also suffers from a lack of green space. That can make it difficult for downtown residents to find places to enjoy the outdoors. Advocates are trying to remedy that — in the face of ongoing downtown development.

Many travelers using United Airlines faced delays Tuesday, but they weren't connected to Hurricane Isaac. Instead, the airline's computer network crashed, leaving large parts of its system paralyzed for several hours Tuesday afternoon.

Alexander Reber, 21, was drawn to politics by his home state governor, Virginia's Bob McDonnell. To Reber, education, transportation and infrastructure are the issues that matter most.

Key speakers Tuesday include New Jersey Gov. Chris Christie and Ann Romney, the wife of the GOP presidential nominee.