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1. U.S. faces Belgium in first knockout round of World Cup

Bring on Belgium! The U.S. soccer team fights to stay in the World Cup, as it goes head-to-head with the Belgian team at 4 p.m. EST. Only a win will let the team advance into the next round. Before the action begins, take a look at the players likely to lead the charge this evening. Video: USA confident against Belgium, worried about referee:

U.S. coach Jurgen Klinsmann is concerned about the Algeria referee picked for the last 16 clash against Belgium, but says he's confident about Team USA going into the World Cup knockout stage. VPC

2. NASA to launch satellite measuring climate change

The $470 million satellite hopes to give scientists their clearest picture of Earth's warming atmosphere by tracking carbon dioxide levels. Created by Orbital Science Corp., it is considered the next powerful tool for measuring signs of climate change on Earth beginning Tuesday.

3. Study finds no connection between vaccinations and autism

A new study finds no evidence connecting immunizations to the cause of autism. The Centers for Disease Control and Prevention is working to dispel the myth that connected autism with a measles vaccination starting back in 1998. Researchers also found that serious complications caused by vaccines are very rare – aiming to reassure parents on the benefits of vaccinations following an increase in preventable illnesses.

4. Lebron James, Dwayne Wade enter free agency

James and Wade — alongside forward-center Chris Bosh — left their contracts with the Miami Heat behind as they became free agents Tuesday. They are free to leave their team, if they choose to do so, and pursue other opportunities in the NBA. Don't be surprised, however, if all three opt to stay.

USA TODAY Sports' Sam Amick explains why it's good right now to be LeBron James after he opted out of his contract with the Heat.

5. Israel airstrikes hit targets in Gaza

Israel carried out a series of airstrikes in Gaza, saying it struck 34 targets across the Hamas-controlled territory. The military said the airstrikes were a response to a barrage of 18 rockets fired into Israel since late Sunday. The bodies of three Israeli teenagers kidnapped more than two weeks ago on their way home from religious school were found shot to death Monday.

Bonus: Happy 35th birthday Walkman

This should be music to your ears! The compact cassette player was first released in 1979, revolutionizing the ways Americans listen to music. Although the product was discontinued in 2010, its impact is still felt today as it laid the ground work for portable music devices like the CD player and, decades later, Apple's iPod.

And, the essentials:

Weather: Thunderstorms in the Eastern Great Lakes are forecast for Tuesday as well as showers in the Southern and Northern Plains.

Stocks: U.S. stock futures are pointing higher.

TV Tonight: Wondering what to watch tonight? TV critic Robert Bianco's here to help.

If you missed Monday's news, we've got you covered here.

You can get the day's top news each weekday in your inbox. Subscribe.

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