This week's question: German researchers have discovered that having children does make you happier — but only once the kids have grown up and moved out. Please come up with a psychological term to describe the surge of joy that parents experience when their offspring finally fly the nest.

Click here to see the results of last week’s contest: Taking Greenland

How to enter: Submissions should be emailed to contest@theweek.com. Please include your name, address, and daytime telephone number for verification; this week, please type "Happy days" in the subject line. Entries are due by noon, Eastern Time, Tuesday, Sept. 17. Winners will appear on the Puzzle Page of the Sept. 27 issue and at theweek.com/puzzles on Sept. 20. In the case of identical or similar entries, the first one received gets credit. All entries become property of The Week.

The winner gets a one-year subscription to The Week.