Bell's theorem shows that quantum mechanics cannot be reproduced by any theory where particles carry hidden properties that are set in advance and only influenced by their immediate surroundings. In 1964 John Stewart Bell derived a mathematical limit that such local hidden-variable theories must obey for the correlations between measurements on entangled particles. Quantum mechanics predicts results that break this limit. John Clauser and Stuart Freedman first observed the violation in a laboratory in 1970. Later Bell tests, which closed experimental loopholes, have consistently confirmed quantum predictions. Physicists still disagree about what the result means for the nature of reality, but the experiments themselves are not in doubt.

Hampi is a UNESCO World Heritage Site in Karnataka, India, with more than 1,600 surviving remains spread over 4,100 hectares. It was the capital of the Vijayanagara Empire from 1336 to 1565. Travellers from Persia and Portugal described it as a prosperous, wealthy and grand city with temples, markets and farms along the Tungabhadra River. By 1500 it was estimated to be the world's second-largest city after Beijing, and probably India's richest at the time. In 1565 a coalition of Muslim sultanates defeated the Vijayanagara Empire, its capital was conquered and destroyed, and the city was left in ruins. Hampi remains a religious centre, with the active Virupaksha Temple at its heart.