Many ceremonies that mark national celebrations and religious rituals incorporate the practice and calligraphy has itself proved influential on modern art, architecture and design.

UNESCO: Culture

However, the cat (or, rather, subatomic particles that behave like the cat) has proved hard to hunt down in practice because such superpositions of states are fragile and easily disrupted phenomena.

ECONOMIST: The 2012 Nobel prizes

The common practice of using sponsor revenue and club seats to cross-subsidize cheap tickets has fostered goodwill and proved a winner.

WSJ: Bayern Munich's Success Has a Downside for Soccer's Bundesliga