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Methodology What is this? Recent posts from sources where the majority of shared articles aligned “very liberal” (blue, on the left) and “very conservative” (red, on the right) in a large Facebook study. In 2015, the journal Science published a research paper by Facebook scientists (Bakshy, Eytan; Messing, Solomon; Adamic, Lada, 2015, “Replication Data for: Exposure to Ideologically Diverse News a

The Singapore government is testing an ambitious range of “smart city” technologies to aid city planners. Tap or click on the numbers to see how they would work. Reporting by Newley Purnell and Jake Maxwell Watts Animation by Chris Philpot for The Wall Street Journal Design by Darren Hayward and Andrew James Animation production by Thomas Di Fonzo and Diana Jou

The Wall Street Journal is tracking changes in mutual funds' estimates of share prices in startup companies that are valued at $1 billion or more. Related: Fidelity Marks Down Startups Including Dropbox, Zenefits »

The number of infected people, measured over 70-some years and across all 50 states and the District of Columbia, generally declined after vaccines were introduced. The heat maps below show number of cases per 100,000 people.

U.S. household net worth reached a record high in 2013—so did wealth inequality. Most of these gains have gone to the wealthiest Americans. They’re also disproportionately distributed among other lines, such as age, race and area. Below are 10 charts that track net worth since 1989, shown by year as well as percent change. Notes: Net worth is the sum of all assets minus the sum of all liabilities.

World War 1 Centenary World War I changed everything. From new countries to literature, from tanks to treaties and from flamethrowers to fashion, the conflict is still writ large on our lives 100 years on. It gave birth to violent dictators and their ideologies but extended the electoral franchise to millions. It ushered in the era of mechanised warfare whilst laying the foundations for modern med

WSJ editors pick the best photos of the year organized by category and date. These photos represent the key moments and defining images of the news in 2013.