People often say that humans have always eaten animals, as if this is a justification for continuing the practice. According to this logic, we should not try to prevent people from murdering other people, since this has also been done since the earliest of times.
—Isaac Singer
iambic pentameter
The most common type of meter in English poetry, in which there are five iambs (unstressed then stressed syllable pair) to a line: "But soft!/ What light/ through yon/der win/dow breaks?" (Romeo and Juliet).