Five Star Gift Ideas

Here are a few gift ideas for your grandpa who loves psychology:

1. Books: You can gift your grandpa some great psychology-related books like "Thinking, Fast and Slow" by Daniel Kahneman, "The Power of Habit" by Charles Duhigg or "The Social Animal" by David Brooks.

2. A Psychology Puzzle: A puzzle with a psychological theme can be a great gift, especially if your grandpa likes solving puzzles. A good option could be the "Psychology Mind-Boggling Puzzle" which includes riddles and puzzles based on various theories of psychology.

3. Online Course: There are several online psychology courses available for free or at a minimal cost on websites like Udemy, edX, etc. You can gift your grandpa access to a course that he might find interesting, and he can learn at his own pace.

4. Psychology Board Game: You can gift your grandpa a board game related to psychology, like the "Psychology Trivia Game" which contains questions based on different areas of psychology.

5. Subscription to Psychology Magazine: You can gift your grandpa a subscription to a psychology magazine like Psychology Today, which will keep him updated with the latest research and developments in the field.

Or you can get him a star map with an important date you share.