Inside X, Google’s Moonshot Factory - The Atlantic

From a ~7,000-word Google X profile

"These ideas might sound too random to contain a unifying principle. But they do. Each X idea adheres to a simple three-part formula. First, it must address a huge problem; second, it must propose a radical solution; third, it must employ a relatively feasible technology. In other words, any idea can be a moonshot—unless it’s frivolous, small-bore, or impossible. 

The purpose of X is not to solve Google’s problems; thousands of people are already doing that. Nor is its mission philanthropic. Instead X exists, ultimately, to create world-changing companies that could eventually become the next Google. The enterprise considers more than 100 ideas each year, in areas ranging from clean energy to artificial intelligence. But only a tiny percentage become “projects,” with full-time staff working on them. It’s too soon to know whether many (or any) of these shots will reach the moon: X was formed in 2010, and its projects take years; critics note a shortage of revenue to date. But several projects—most notably Waymo, its self-driving-car company, recently valued at $70 billion by one Wall Street firm—look like they may."

Inside X, Google’s Moonshot Factory - The Atlantic