To make them sensitive to the deflection caused by pressure, the researchers carved grooves in the fibres along their length so that the bouncing of the light was less efficient at the point where pressure was applied.

BBC: 'Magic carpet' can detect or even predict a fall

There is very little pressure on British gas to be efficient and to keep these price rises to a minimum.

BBC: British Gas vehicle and employee

Downward pressure on reimbursements might shake out less efficient operators.

FORBES: Community Health Systems Makes Hostile $7.3 Billion Bid For Tenet