Some conventional weapons or legal crowd control can also release smoke that causes respiratory problems, a common symptom of chemical weapons exposure.

CNN: Israeli official: Syria using chemical weapons

An eclectic crowd made up of conventional art lovers, edgy artists and craft enthusiasts wanders through, reflecting on an equally diverse collection of exhibits, from 1980s crayon drawings to a towering 19th-century weathervane.

BBC: New York City uncovered

Among this crowd, ABC Family had always struck me as a conventional teen-age girl, all white teeth and scrunchies.

NEWYORKER: Seen but Not Heard