How do you rebuild the alchemy lab on virtual villagers 3?

To rebuild the alchemy lab you need an adept scientist (or master, it will be faster with more people) to collect the scattered things around the village they will be: 2 pots red with white stripes and yellow with white stripes, a brown pot, a grey bowl with spoons, and a small spear. To collect them drop your scientist(s) on each item ,then they will place them in the alchemy lab. if they drop the item it will go back to where you first found it. Collecting all five items solves the puzzle.