In a 24-hour period over the holiday weekend, three passenger planes crashed across the globe in South Korea, Canada and Norway. In South Korea, a Boeing 737-800 jet with 181 passengers onboard veered off course, crashing into a wall; an Air Canada DH8 plane became engulfed in flames after a crash landing in Nova Scotia; and an Amsterdam-bound flight to Norway made an emergency landing following a "hydraulic failure" on a Boeing 737-800 at Torp Airport. The trio of incidents mark at least four crashes in seven days globally.

SEE HOW WINTER WEATHER IMPACTED US HOLIDAY TRAVEL

President Joe Biden says he believes that he could have beaten Donald Trump in the recent election if his party hadn't pressured him to drop out of his reelection campaign. Although he admitted errors that led to the end of his presidency, including his bad debate performance against Trump, Biden and some aides think he should have stayed in the race despite pressure from Democrats to step aside for Vice President Kamala Harris. Those same aides believe Biden would have beaten Trump but added neither they nor the president blame Harris.

SEE BIDEN'S RATIONALIZATION FOR HOW HE COULD HAVE WON

President-elect Donald Trump sided with tech barons like Elon Musk, saying that he backs a special visa program that helps highly skilled workers enter the country. An angry back-and-forth, largely between Musk and traditional anti-immigration Trump backers, erupted in fiery fashion, with Musk vowing to "go to war" over H-1B visas. Trump's insistent calls for curbs on immigration were central to his election win, vowing to deport undocumented immigrants and limit legal immigration.

SEE WHAT MUSK IS SAYING ABOUT THE ISSUE OF IMMIGRATION

In the US, what is the annual cap on the number of H-1B visas issued?

Friday's answer: China's Wangu mine boasts the largest gold deposits, while the US has the largest gold reserves (8,133 tonnes, $628 billion).