Name	Provider	Purpose	Expiration
_ga	Google	A Google Analytics cookie that is used to calculate visitor, session, campaign data and keep track of site usage for the site's analytics report. The cookies store information anonymously and assign a randomly generated number to identify unique visitors. Optout at https://tools.google.com/dlpage/gaoptout	730 days
_gat	Google	A Google Analytics cookie used to throttle the request rate. Optout at https://tools.google.com/dlpage/gaoptout	1 day
_gid	Google	A Google Analytics cookie used to store information of how visitors use a website and helps in creating an analytics report of how the website is doing. The data collected including the number visitors, the source where they have come from, and the pages visited in an anonymous form. Optout at https://tools.google.com/dlpage/gaoptout	1 day
rc::a	Google	A Google cookie that is used to distinguish between humans and bots. This is a persistent cookie.
rc::c	Google	A Google cookie that is used to distinguish between humans and bots. Lasts for the duration of the session.

Publications

Easy to Read version of NAS Annual Report 2019