Burnley's first-half composure had disappeared and Spurs hit the Clarets again with two more goals inside three minutes to seal the victory - and almost certainly a place in a second successive final.

BBC: Tottenham 4-1 Burnley

It is possible to seal borders tightly enough to keep more people out if those inside are ready to pay the price.

ECONOMIST: Open up | The

All that was needed to make a mechanical energy-storage system was a good enough rotational seal, so the flywheel could spin freely inside a vacuum chamber with no air resistance.

ECONOMIST: Tech.view: Boost for Formula One | The