Based on the available information, "A Bone of Fact" by David Walsh explores a variety of themes and topics. These include:
* **Ethics** The book examines ethics, applying statistical knowledge to subjects like eating meat, gambling, and abortion 【1】.
* **Atheism and Evolution** Walsh shares his views on atheism and evolution 【2】.
* **Sex and Death** These are recurring themes in the collection 【3】.
* **Art and Collecting** The book delves into the flights of fancy of a patron collector, with many items related to art 【3】【4】.
* **Personal Views and Reflections** The book contains David Walsh's personal views and reflections on various subjects 【2】.