The vicious shade-throwing by the Treasury secretary's wife, Louise Linton, Monday was intended to put an Instagram commenter on blast, but it almost immediately blew up in the Scottish-born actress' perfectly made-up face.

Now, nearly a full day later, the 36-year-old has apologized through a spokesperson.

The four suspected members of a terror cell — the only members believed to be alive — appeared in a Madrid court Tuesday in connection with the attacks in Spain last week that killed 15 people.

The hearing took place behind closed doors. But numerous Spanish and international news outlets say multiple suspects testified that a former imam was the mastermind of a failed plot to use explosives in a large-scale attack.

To get a sense of how severe the opioid crisis is in the U.S., you can look at the number of fatal overdoses — more than 33,000 in 2015, according to the Centers for Disease Control and Prevention. That means, on average, 91 people are dying after overdosing on opioids each day. And for every fatal overdose, there are believed to be roughly 30 nonfatal overdoses.

On May 25, 1978, a package exploded at Northwestern University in Evanston, Ill., injuring a security guard. It was the first of a series of 16 bombings that would occur over the next 17 years, killing three people and injuring many others. The suspect in the case, a shadowy figure who frequently used the U.S. mail to send his homemade explosives, became known as the "Unabomber."