Some really cool premises. But, wow, most of them have terribly unsatisfying endings.

Tower of Babylon 2⭐
Understand 2⭐
Division by Zero 3⭐
Story of Your Life 4⭐
Seventy-two letters 2⭐ (least favorite)
The Evolution of Human Science 3⭐
Hell is the Absence of God 3⭐
Liking What You See 4⭐ (my favorite)