MINNEAPOLIS (WCCO) — From a failed San Bernardino bomb to couples celebrating National Spouse Day, here are the four things to know for Tuesday, Jan. 26.

Failed California Bomb

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A bomb left behind by the couple responsible for the San Bernardino shootings failed because it was poorly constructed.

That’s according to law enforcement officials.

They say the couple drove around the city after the shootings — but stayed close – apparently trying to detonate the remote-controlled bomb.

The attack left 14 people dead.

Twitter Exodus

Four of Twitter’s top executives are leaving the company.

They are the product chief, the head of engineering, the vice president of global media and the general manager of Twitter’s “Vine” unit.

A source close to the company cited a number of factors for the departures, including burnout.

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Twitter is no stranger to a revolving door of senior executives.

The company has undergone a number of changes since it’s co-founder was named permanent CEO in October.

Doomsday Clock

Scientists will announce Tuesday how close the world is to global catastrophe — by placing the hands on the so-called Doomsday Clock.

The closer the clock is set to midnight – the closer they think a global disaster will happen.

Last year, it was set to three minutes to midnight because of climate change and the ongoing threat of nuclear weapons.

National Spouse Day

Don’t wait until Valentine’s Day to share your love — Tuesday is National Spouse’s Day.

Busy schedules, work, kids, chores — they can all get in the way. And we can often take our spouses for granted.

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So, take time to let your spouse know just how much they are appreciated!