Cold Weather
Freezing temperatures are expected in the Midwest and on the East Coast. NOAA

Today marks the first full week of work and a return to a normal schedule after two weeks of holidays, so you might need to get up to speed on some major stories. On Monday, the search for AirAsia Flight 8501 continued with teams recovering what is believed to be the tail section of the plane and four more bodies. Here's what you should be reading today.

Cold Weather For (Almost) Everyone Across The U.S.

Get ready to bundle up this week as a cold snap is expected to bring freezing temperatures to most of the country. The Midwest and East Coast will be particularly hard hit, the Associated Press reported. Expect freezing temps in those regions, with some areas expected to go sub-zero. The cold weather will extend south to Florida later in the week. The Weather Channel is calling this round of cold and snow Winter Storm Gorgon. On Sunday, snow began to fall in the northern Rockies and will travel across the Central Plains and parts of the Ohio Valley. Chicago is expected to get five to eight inches of snow, while Indianapolis could see up to three. For up-to-date warnings and alerts, visit the National Weather Service.

Jury Selection Begins For The Boston Marathon Bombings

The high-profile trial of Dzhokhar Tsarnaev, who, along with his deceased brother, Tamerlan Tsarnaev, is accused of committing the 2013 Boston Marathon bombings, began with jury selection on Monday. The jury pool consists of 1,200 people and the selection process will be conducted under tight security. Tsarnaev's attorney wanted the trial moved from Boston, but the request was denied. The trial is expected to go on for several months, and if Tsarnaev is convicted, the jurors will have to decide whether he deserves the death penalty.

The Deadly Disco Clam

Researchers are unraveling the mystery of Ctenoides ales, the funky little bivalve that's commonly known as the "disco clam" -- named so for the strobe lights it emanates. Researchers recently discovered the source of the lights: mirrored lips that reflect surrounding light as the sea creature opens and closes its mouth. Lindsey Dougherty, a researcher from the University of California, Berkeley, made the discovery, and her most recent study explores the phenomenon. It seems the disco clam may be using its natural strobe lights to lure prey.

Doomsday

How the world will end is a morbid but endlessly fascinating subject. Whether it's the sun expanding to the point where Earth's oceans evaporate in 2.8 billion years or some other environmental disaster, Earth's potential fate is constantly pondered, and one recent study has caused a stir. The study posits that a star could hypothetically create a disruption in the Oort Cloud, which could lead to a hail of comets on a collision with Earth. The study's author, Coryn Bailer-Jones, from the Max Planck Institute for Astronomy, explains, "A close encounter will likely increase the flux of comets, and that will increase the chance per year of the Earth being hit. But it increases it from a very, very small value to just a very small value." But there's no need to panic just yet. The time scales are very long, says Bailer-Jones: "We're talking hundreds of thousands, or millions of years," NBC News reported.