An explosion-like earthquake felt around the globe has led many to believe that North Korea conducted a nuclear test on Tuesday.

Although Pyongyang had been threatening to conduct such a test for weeks, they did not confirm that it did in fact conduct such a test. Following the quake, the South Korean Defense Ministry raised their military alert level and was still trying to figure out if such a test had been conducted.

If the test was conducted, it would be another challenge to the United Nations Security Council, which recently imposed sanctions against Pyongyang for a long-range missile test. In wake of that rocket launch in December, the U.N. Security Council ordered North Korea to respect a ban on nuclear tests or they would be met with "significant action" by the U.N.

Happy birthday to actor Burt Reynolds, who turns 77 today (Monday). Burton Leon Reynolds, Jr. got his career started in the '60s appearing on  several television shows including Gunsmoke. His film career took off after roles in Deliverance and The Longest Yard and led to starring roles in Smokey and the Bandit, The Cannonball Run and Boogie Nights.

The Grammy Song of the Year category honors the unsung heroes of the music business -- the songwriters.

Of the five songs nominated, only two of them were co-written by the artist who sings them -- Eric Church's "Springsteen" and Ronnie Dunn's "Cost of Livin'.'"

Here's a rundown of the Country Song of the Year nominees and the writers up for the award:

• "Blown Away" - Josh Kear and Chris Tompkins, songwriters (Carrie Underwood)
• "Cost of Livin'" - Phillip Coleman and Ronnie Dunn, songwriters (Ronnie Dunn)
• "Even If It Break Your Heart"- Will Hoge and Eric Paslay, songwriters (Eli Young Band)
• "So You Don't Have to Love Me Anymore" - Jay Knowles and Adam Wright, songwriters (Alan Jackson)
• "Springsteen" - Eric Church, Jeff Hyde and Ryan Tyndell, songwriters (Eric Church)

The Grammy Awards will air live Sunday at 7 pm on CBS.