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.

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.

Vladimir Putin has held power for twenty years now, alternating between the prime minister's seat and the presidency twice. He has made himself so indispensable to Russia's political system that even the speaker of the legislature has mused that "without Putin, there is no Russia." The constitution says he can't serve as president again after his current term ends in 2024 – but he'll find a way to keep power somehow. As he starts to lay those plans, here's a look back at his approval rating over the past two decades.

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.

Prime Minister Modi of India and the ruling BJP have tried to divert attention away from the country's slowing economic growth (its worst economic slowdown in six years) with words and actions designed to appease their Hindu nationalist base. Here's a look at India's GDP growth rate in 2019 and projections for 2020.

Institutional constraints have blocked much of President Trump's agenda, but they haven't stopped him from dividing the nation. The House has impeached him, and the Senate will acquit him, creating a dynamic that will ensure that, no matter who wins, the November election is perceived as "rigged" by a large percentage of the population. Here's a tally of the percentage of the public that believes the presidential election will be fair.

Since the dawn of time, human beings have been on the move in search of a better life. Today, more than 270 million people live outside the country of their birth, 51 million more than in 2010. That number includes economic migrants, refugees, displaced people, and plain old expats. Here's a look at the countries where migrants, both leaving and arriving, make up the largest share of the population.