The hammer and feather were cleared by NASA. But during the same mission, the crew got into trouble for carrying postal covers into space to sell later. John Young famously got into trouble for smuggling a corned beef sandwich onto a Gemini mission in 1965. Alan Shepard actually cleared the golf club and balls.
If you're going to put Jello in the freezer, you better set a timer! But if you don't have someplace you gotta be, this is a great all-day project you can do in between gardening or something. Here's a recipe that has about half as many layers, but can be adapted.
Mom kept powdered milk around "for emergencies," which I guess meant recipes. That stuff is awful. Then I found out the family next door, with seven kids, drank it all the time. That's the only kind of milk they had outside of school.