Whatever concerns health is of real public interest.

Public interest is a very unruly horse.

A person who speaks honestly in the public interest has, most often, to pay unfortunately the heaviest interest imposed upon him by none but the beneficiary people only from the public

some land swaps have clearly been in the public interest

Science, it is said, no doubt has ameliorated the material conditions of human life, but is powerless to solve those moral and philosophical questions that interest cultured people so deeply.

There are excellent public interest grounds to have a search engine whose rankings are transparent.