A microscope photo of a cross section of a mouse nose. The mouse was genetically modified to express green fluorescent protein in smell neurons. A small subset of dying neurons is labeled in red.

Kendra Pierre-Louis: For Scientific American’s Science Quickly, I’m Kendra Pierre-Louis, in for Rachel Feltman. In late 2024 Nicola Coughlan, the actor famous for her work on Derry Girls and ...