Sir Elton John and his partner David Furnish become parents after a surrogate mother from California gives birth to a son on Christmas Day. The boy is named Zachary Jackson Levon Furnish-John.
South Australia finalizes a deal with Tesla, spearheaded by tweets originating from CEO of Tesla Elon Musk, to install a battery system in the state. Tesla said in a statement that upon completion by December 2017, the system would be the largest lithium-ion battery storage project in the world, overtaking an 80 megawatt-hour power station at Mira Loma in California also built using Tesla batteries.
Umar Farouk Abdulmutallab, a Nigerian man also known as the "underwear bomber", pleads guilty to attempting to blow up an airliner on Christmas Day 2009 in a trial in the U.S. city of Detroit, Michigan.
New York Governor Andrew Cuomo signs New York State's Marriage Equality Law, legalizing same-sex marriage in New York, and making New York the largest U.S. state to approve such legislation since California reversed its legalization in 2008.