5: These can be checkered
10: Reason and Enlightenment
15: Along the line of rotation
17: Lively Italian folk dance
19: Tour de France vehicle
21: Frequent Las Vegas money taker
27: They hang around the house
31: Photo ___ (campaign events)
42: Cell affected by serotonin
57: Bridle path excursion
62: Where cookies might crumble
69: Loved to excess (with 'on')
70: Responds correctly on 'Jeopardy!'