Largest known prime number The Great Internet Mersenne Prime Search announces the discovery of the latest largest known prime number, a Mersenne prime with 23,249,425 digits, equal to 2 77,232,917 − 1.
Cybersecurity Security researchers disclose two hardware vulnerabilities—Spectre, which affects most modern processors, and Meltdown, which affects most Intel chips.
Presidential Advisory Commission on Election Integrity U.S. President Donald Trump dissolves the voter fraud commission noting the cost to the public of litigating against lawsuits from states objecting to the voter information requested.
Ethiopian Ethiopian Prime Minister Hailemariam Desalegn announces that Ethiopia will drop charges against all political prisoners and close down the infamous prison camp of Maekelawi.
Law of Iceland A new Icelandic law goes into effect which requires government agencies and companies with more than 24 full-time employees to prove they are paying men and women equally, as required by existing legislation.
Storm Eleanor Winter storm Eleanor moves from the British Isles to continental Europe with one dead in France as well as injuries and material losses in Germany, Netherlands and Switzerland.