What aspect do both "Death by Black Hole" and "Man Listening to Disc" share in their exploration of subject matter?

The connection between "Death by Black Hole" and "Man Listening to Disc" lies in their shared exploration of emotional turmoil. Both works delve into the inner emotional world of their subjects, whether by examining the complex feelings associated with grappling with vast cosmic ideas or through the introspective experience of listening to music. This emotional engagement allows readers to connect more deeply with abstract concepts, making the themes of existential reflection and personal struggle poignant and relatable.

In contrast, other aspects mentioned, such as connections between math and music, references to famous historical figures, and predictions about human evolution, are not central themes in both works. While there may be moments where these themes intersect in different contexts, they do not represent the primary focus shared by both authors.