User talk:2600:1015:B021:5800:4DF9:86F8:B3E3:381A

Recent edit to Mary Downing Hahn
Hello, and welcome to Wikipedia. I noticed that you made a change to an article, Mary Downing Hahn, but you didn't provide a reliable source. It's been removed for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you! Materialscientist (talk) 07:20, 29 December 2018 (UTC)