Nudibranchs: psychedelic thieves of the sea
https://www.nhm.ac.uk/discover/nudibranchs-psychedelic-thieves-of-the-sea.html
This article from the Natural History Museum in London offers facts about the group of sea mollusks called nudibranchs to which Butler alludes in Part 1, Chapter 2.
The CRISPR-baby scandal: what’s next for human gene-editing
https://www.nature.com/articles/d41586-019-00673-1
This article provides perspective on the legal and ethical murkiness around human genetic modification.
The Five Stages of Grief
https://www.verywellmind.com/five-stages-of-grief-4175361
This article outlines Elisabeth Kübler-Ross's Five Stages of Grief.