Virtual Villagers: The Lost Children Cheats

This is something every walkthrough and hint I've seen forgets: what about the dead bodies
The Cemetery is the open field north east of the research table. Take all adults there and allow them to reflect when there is time and they will remember and bury any bones from deceased villages [those that die of old age,etc.] automatically. You won't need to complete a puzzle or any such; they just need to know it's there.

Puzzle 2 is the construction of a dam that will divert water from the stream to an area that can be used for farming. After you purchase Level 2 of Engineering Tech, drag a villager to the rocks that are in the middle of the lower portion of the stream. You will see a message, "He/she could probably build a dam here."

Puzzle 7 is the elimination of the algae in the ocean that was caused by over fishing. After purchasing Level 3 of Farming Tech, take a master farmer or master scientist to the pond, where they will collect algae-eating fish that they can use to repopulate the ocean. Once sufficient fish have been placed in the ocean, the algae will once again be under control and the villagers will have unrestricted fishing.