Three things you need to know today.
President visits Puerto Rico: President Barack Obama makes a rare presidential visit to Puerto Rico on Tuesday, spending about five hours there on a trip aimed as much at Puerto Ricans on the mainland as those on the island.
The roughly 4 million residents of the U.S. Caribbean territory are American citizens but can't vote for president, while the almost 5 million Puerto Ricans living in the 50 U.S. states have full voting rights, and Obama needs strong support in 2012 from what traditionally has been a largely Democratic constituency.
In particular, an influx of Puerto Ricans has moved in recent years to central Florida, a key swing state in Obama's re-election campaign. Other states with large Puerto Rican communities include New York and Connecticut.
Obama's trip, the first official presidential visit to Puerto Rico in 50 years, shows "the importance the Hispanic vote has in his re-election campaign," said political analyst Angel Rosa.
Obama will make a brief speech on arrival at Muniz Air National Guard Base and then visit La Fortaleza, the oldest executive mansion in the Western Hemisphere, according to a White House document.
The president also will attend a Democratic National Committee event before returning to Washington on Tuesday night.
Spider-Man on Broadway: The retooled version of "Spider-Man: Turn Off the Dark" opens on Broadway on Tuesday after going through millions of dollars in development costs, six delayed openings and a record-setting 180 preview performances.
The original concept for "Spider-Man" was the vision of Julie Taymor, the Tony Award-winning director of the stage version of The Lion King. She was pushed aside by producers in March, although she reportedly retains some involvement in the show.
Musical collaborators are U2 bandmates Bono and the Edge, who wrote the show's music and lyrics, stayed on and added several new songs while rewriting a few others. Also added to the revamped show are an additional five flying sequences and expanded roles for Aunt May, Uncle Ben and love-interest Mary Jane Watson.
Radiation detectors for Japanese kids: Officials of Japan's hard-hit Fukushima city will begin handing out radiation measuring devices to 34,000 children in a plan to help calm fears about radiation.
Fukushima city is about 60 kilometers (37 miles) from the Fukushima Daiichi Plant, which experienced full meltdowns at three reactors in the wake of the earthquake and tsunami on March 11.
The measuring devices, called dosimeters, will be given to the children for three months starting in September, officials said.
The devices wil be given to nursery schools, kindergartens, elementary schools and middle schools in the city.