A documentary about gun violence that has its premiere on HBO on Monday has been given extra topicality by the massacre in Charleston, S.C.

The SI unit of velocity is metres per second, derived from the base units metre and second.

dead right; dead level; dead flat; dead straight; dead left

Most pregnancies with agnathic fetuses are associated with polyhydramnios, which probably result from fetal inability to swallow because of persistence of the oropharyngeal membrane.