Copyright ©2021 by The Writing Lab & The OWL at Purdue and Purdue University. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. This website collects and publishes the ideas of individuals who have contributed those ideas in their capacities as faculty-mentored student scholars. The materials collected here do not express the views of, or positions held by, Purdue University. Use of this site constitutes acceptance of our terms and conditions of fair use. Privacy policy.