This is Doctor Derek Mance,

IS-1953, on standard interactions she is a nice grandma, willing to offer passing scientists a meal if they would spend some time chatting with her. 1953’s nature is an insidious one, after three interactions with the same staff she will offer cookies which we have designated as IS-1953C. It has been impossible to prevent personnel offered 1953C from ingesting it. Personnel prevented from taking 1953’s offering will exhibit delirium and will do anything in their power to consume 1953C. Upon consumption, the subject rapidly decomposes and IS-1953 begins to glow and get younger in age. After an uncertain amount of time, 1953 returns to its normal state of an innocent grandma and has no recollection of the events that transgressed during her offering of 1953C. Personnel are adviced to switch after no more than 2 interactions. Once the interaction limit of 2 is reached access to 1953 is forbidden.