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7 things to know now: Presidential debate; Musk on Mars transporter; 'big meteor' in Australia

Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton are introduced during the presidential debate at Hofstra University in Hempstead, N.Y., Monday, Sept. 26, 2016.

Here's a roundup of news trending across the nation and world today.

What to know now

1. First debate: He said he'd release his taxes when she releases her emails. She said she's prepared to be president and that he's "dangerous." There was no shortage of fireworks at the first presidential debate between Donald Trump and Hillary Clinton in New York on Monday. The Democratic and Republican candidates argued trade, ISIS, race issues, "stop and frisk," and who has stamina during the 90-minute debate. Both sides claimed victory.

2. Musk to Mars: Elon Musk is expected to outline his plan to build a city on Mars within the next 10 years as he speaks at the International Astronautical Congress meeting Tuesday in Mexico. Reportedly, in the speech, "Making Humans a Multi-planetary Species," Musk will talk about his "Mars Colonial Transporter" which he says will take 100 people at a time to Mars.

3. Iowa flooding: The Cedar River is expected to crest at 23 feet Tuesday in Cedar Rapids, Iowa, which would cause the second largest flood in the city's recorded history. Residents there have placed sandbags and other barriers to hold back the rising waters which are already 4 feet above major flood stage.

4. The new SAT: The new version of the SAT college entrance exam has been taken by nearly a million and a half high school students since its debut in March, according to the company that owns the test. The new test offers more "real world" vocabulary and has a new format. No word on scores yet.

5. Rescued at sea: A Vermont man whose family says he has a form of autism was rescued off the coast of Massachusetts on Sunday after spending a week at sea in a life raft.  Nathan Carman, 22, and his mother, Linda Carman, were last seen on Sept. 18 when they left to go on a fishing trip on Nathan's boat. A freighter found Nathan Carman adrift in the life boat, but there was no sign of his mother.  Carman told Coast Guard officials his boat ran into trouble and sank quickly. He said he tried to find his mother after the boat sank, but could not.

And one more

People are still trying to figure out what caused a bright flash and loud boom over the skies of northeastern Australia Monday. Residents reported that the earth shook as they saw a bright light streak across the sky. Scientist say it was likely a "big meteor" strike.

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