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Here are the 5 things you need to know this Tuesday, according to USA Today.

One month since Malaysia Flight 370 disappeared

It's been one month since Malaysia Flight 370 vanished, and now a ship is scrambling to again find signals -- first detected over the weekend -- that the missing flight's black boxes could be emitting under water. Searchers had no luck re-acquiring the signal Monday, during their hunt about 1,000 miles off the coast of Perth, Australia. If they can pinpoint the location, an unmanned miniature submarine can be sent deep into the Indian Ocean to try to identify wreckage and find the two black boxes.

End of an era: Support for Windows XP is over

Today Microsoft will cease support for Windows XP, the software that's so old it predates 9/11. No, your XP computer won't suddenly blow up on that date. But it does mean that official support from Microsoft ceases. Microsoft will no longer issue patches or system updates to protect the machine against viruses, spyware and other malware that could result in crashes, or worse, the theft of personal information. If you run into any other kinds of snags, you won't be able to call Microsoft for technical assistance.

UConn, Notre Dame face off in blockbuster women's title game

After five-plus months of basketball, this is what it has come down to: undefeated Connecticut vs. undefeated Notre Dame for the national championship in women's basketball. On Tuesday night, history will be made at Bridgestone Arena. For those keeping score, it is the first time in 75 years that two unbeaten teams have played for a national championship in basketball.

Obama to take executive action on equal pay

President Obama will announce a pair of moves today that his administration says will strengthen enforcement of equal pay laws for women. First, Obama will sign an executive order banning federal contractors from retaliating against employees who discuss their compensation. The president will also sign a presidential memorandum instructing Labor Secretary Tom Perez to establish new regulations requiring federal contractors to submit to the Department of Labor summary data on compensation paid to their employees, including data by sex and race.

Rare cosmic sight: Sun, Mars and Earth will align

Skywatchers will get a rare treat tonight, when Mars, Earth, and the sun will be arranged in a nearly straight line. Every two years, Mars reaches a point in its orbit called "opposition," when the planet lies directly opposite the sun in our sky. This means Mars rises near sunset and remains visible all night long as it moves nearly overhead across the night sky. It will be a bright burnt orange color, NASA's Mars Exploration Program reports, and almost 10 times brighter than the brightest stars in the sky.

Bonus:

Hank Aaron's march to history ended 40 years ago today, when his

715th home run

vaulted him past Babe Ruth as baseball's all-time home run leader. "It doesn't seem like it's been 40 years, and I think more people appreciate it now than 20 years ago," Aaron says. "History has a way of doing that. People appreciate it more the longer it lasts."

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