January 27 marks 75 years since the liberation of Auschwitz-Birkenau, the largest Nazi extermination camp. But even as some 40 heads of state gathered in Jerusalem this week to commemorate the six million Jews who were killed, a recent Pew survey revealed that many American adults don't know basic facts about the ethnic cleansing of Europe's Jews during the Second World War. Fewer than half of those polled knew how many Jews were killed in the Holocaust, and close to a third didn't know when it actually happened. Here's a look at some of the numbers.

1: The Greek parliament has elected a woman president for the first time since the country's independence some 200 years ago. A political outsider, Katerina Sakellaropoulou is a high court judge with no known party affiliation. "Our country enters the third decade of the 21st century with more optimism," Greece's prime minister said.

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The new coronavirus, which first surfaced in the central Chinese city of Wuhan, has already killed nine people and infected at least 440 people in China. Only a month since the virus was first identified, it has spread far beyond China's borders to Japan, South Korea, Taiwan, and the United States. Global financial markets have already shuddered at the prospect that mass travel during the upcoming Chinese New Year holiday could trigger a much wider pandemic. Here's a look at where the Wuhan coronavirus has spread so far.

Since Martin Luther King Jr delivered his iconic "I have a dream" speech in August 1963, the number of Black Americans elected to the United States Congress has dramatically increased. Still, it wasn't until last year, more than half a century later, that the share of Black members serving in the House of Representatives reflected the percentage of Black Americans in the broader population —12 percent. To date, only six states have sent a Black representative to serve in the US Senate, and many states have never elected a Black representative to either house of Congress. Here's a look at Black representation in every US Congress since 1963.

It's been nine years since Libya's long-time despot Muammar Qaddafi was killed in a violent uprising, bringing the oil-rich country to the brink of civil war. That conflict entered a new stage last year when violence between warring factions competing for territory intensified around Tripoli, Libya's capital, leading to the displacement of some 300,000 civilians. In recent weeks, fighting has intensified again, and ceasefire talks have failed. Here's a look at who's who and how we got here.

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1.7 billion: Hong Kong's embattled chief executive Carrie Lam has pledged $1.7 billion in state spending to ease residents' financial burdens ahead of February's annual budget. Anti-government protests in Hong Kong have dealt a major blow to the city's once-booming economy, leading to its first recorded recession in a decade.

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After months of rollercoaster hype, the US and China are readying to sign a so-called "phase one" trade deal that eases some tariffs on Chinese products. Meanwhile, Beijing has committed to large scale purchases of some US goods and services. The preliminary deal will also address some of America's long-term concerns over intellectual property issues. Here's what we know about the US-China "phase one" trade pact.