Common

• Fix: code styling for source code both inline and in fenced blocks (#430)
• Change: Every book source now includes from a single common acknowledgments document

In One Weekend

• Fix: Correct typo: "consine" to "cosine"

The Next Week

• Fix: shared_ptr dereference and simplify code in hittable_list::bounding_box() (#435)
• Fix: Erroneous en-dash in code block. Replace –> with -> (#439)
• Fix: Introduce u,v surface coordinates to hit_record (#441)
• Fix: Add highlight to new hittable::bounding_box() method (#442)

The Rest of Your Life

• Fix: unitialized variable in first version of integrate_x_sq.cc
• Fix: remove unreferenced variables in several sample programs
• Fix: correct program computation of the integral of x^2 (#438)