At present, 2.5 million miles of existing natural gas pipelines exist in the United States, according to the National Transportation Safety Board.

FORBES: Pipeline Explosion Rattles Natural Gas Industry

Cloud computing takes existing physical servers and creates virtualized servers to exist on top of them.

FORBES: Cloud Computing and Mobile Processing Saves Small Business

What we have said is that we feel confident, given the nature and the limitations on the mission, that it can be paid for within existing budget appropriations because there are funds that exist for that purpose.

WHITEHOUSE: Press Briefing

Unable to purchase private coverage due to his serious pre-existing condition (a problem that will no longer exist thanks to health care reform), Shepherd had no other option but to go on Medicaid.

FORBES: BrewerCare- Death By Budget Cut

The new system of auto-enrolment, which started last autumn, will eventually see several million low and middle-income workers automatically recruited into new or existing DC schemes, where either the employer schemes did not exist before, or where the employees had decided not to join.

BBC: Pension scheme closures speed up

Existing physics provides no plausible explanation for this, but if sterile neutrinos do exist then they would be formed in supernovas and ejected in a way that could give just such a kick.

ECONOMIST: Research from the beginning of time