* NOTE: with radiation it is possible to cool a body below the *environmental temperature** (e.g., [Catalanotti et al., 1975](https://www.sciencedirect.com/science/article/abs/pii/0038092X75900626) and ).
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* NOTE: with radiation it is possible to cool a body below the **environment temperature** (e.g., [Catalanotti et al. (1975)](https://www.sciencedirect.com/science/article/abs/pii/0038092X75900626) and [Raman et al. (2014))](https://www.nature.com/articles/nature13883)).