Believe it or not, a tenth of all American electricity generated since 1993 has come from Soviet nukes. A deal struck at the end of the Cold War turned 500 tons of bomb-grade Russian uranium into fuel for nuclear plants, and the last shipment of old warheads shipped this week. Celebrate by seeing what kind of score your brainpower can generate on this week's Slate News Quiz.

Question 1 of 12

"It unifies the Chinese people" and "It makes people funnier" were two of the "surprising benefits" of what, as listed by China's state media on Sunday?

Air pollution in eastern China reached record levels last week, more than 14 times the World Health Organization's recommended safe limits.

Question 2 of 12

This week, regulators finally approved the Volcker Rule, passed by Congress in 2010 in the wake of the financial crisis. What, roughly speaking, is the Volcker Rule?

Question 3 of 12

Pictures circulated this week of first lady Michelle Obama looking distinctly unamused at Nelson Mandela's memorial service, while her husband did what?

The prime ministers of Britain and Denmark also took part in the funereal foto fun.

Question 4 of 12

United Nations-backed French troops are trying to restore order in what country, where the Seleka militia took power in March?

Question 5 of 12

What company hired Mary Barra as a factory floor intern 33 years ago, and this week named her its new CEO?

Barra is the first woman ever to lead one of Detroit's "Big Three" automakers.

Question 6 of 12

On Wednesday, what became the world's first nation to completely legalize the marijuana industry?

Uruguayans holding joints, green balloons, and Jamaican flags gathered outside Congress as the Senate approved the new law.

Question 7 of 12

For the first time ever, the wings in this year's Victoria's Secret Fashion Show came from where?

Question 8 of 12

"It's more like you'd see on Mars," said environmental scientist Ted Scambos on Monday, describing what?

Satellites detected a temperature of minus 135.8 F on a plateau in east Antarctica, the coldest ever measured on Earth.

Question 9 of 12

Paul Ryan and Patty Murray appeared together at a Tuesday press conference, announcing a deal that they hope will avert what?

Question 10 of 12

Facebook engineer Dan Muriello says the site may add what new button, an alternative to the familiar "like"?

The button was developed to help users respond more appropriately to bad news.

Question 11 of 12

"The heart is a strong muscle; he's proposing a rigorous exercise plan," wrote Time magazine this week about what man, its 2013 Person of the Year?

Question 12 of 12

On Dec. 20, a factory in Brazil will produce the last of what 20th-century icon, after decades of production?

In its 63rd year, the famed "Type 2" camper van is still a hit in Latin America but is being discontinued due to new Brazilian vehicle safety laws.