The Museum of Natural History’s annual ID Day connects the public to experts who can solve mysteries about artifacts they bring in for identification — from fossils and bones to arrowheads, shells, rocks and insects.

ID Day is at noon-5 p.m. Sunday in the Ruthven Museums Building, 1109 Geddes Ave. Artifacts will be studied by experts from the fields of paleontology, anthropology, archaeology, botany, zoology and geology. The experts also share items from their own collections.

No appraisals are given.

Identity and disability are focus of educator and author

Identity matters to the way faculty teach and to interactions with students. This is the theme behind author Stephanie Kerschbaum’s talk “Identity, Disability and Markers of Difference,” at 1 p.m. Tuesday at Angell Hall, Room 3222.

Kerschbaum is an associate professor of English at the University of Delaware, where she teaches writing studies, rhetoric and disability studies. Her book “Toward a New Rhetoric of Difference,” won the 2015 Advancement of Knowledge Award from the Conference on College Composition and Communication,

She says one way to describe markers of difference is that when people talk with others, they try to present themselves in a way others will recognize — through decisions about what to say, how to say it and more. “When someone can tell that others aren’t reading them the way they want to be read, then they might display a marker of difference — a cue that is aimed at shifting the other person’s understanding or interpretation or which may indicate a difference between the people who are interacting,” she says.

The talk is presented by the U-M Initiative on Disability Studies.