I have been given as a child also this cosmos-idea. That was very exciting, but it has made not really aware at that age, that this is to living beings. I have the nauplia even then regularly under the microscope students considered what have mostly not survived since the microscope was illuminated with a light bulb and all too soon, the water droplet with the "delinquent" therein is dried. One should make the child realize that it is not just a toy. In any case, the guide is good to study and if you take it seriously, you get a kind of small sea water aquarium is not around, so that feel good. This brine shrimp Artemia Salina or were called sold by dubious dealers in comics and magazines as Sea Monkeys or offered by the creators of the magazine YPS repeatedly as though serous with good background information. Bad thing was that at that time neither food nor could any buy more important things for the long term survival of crabs in my day or even no tips to found in the manual. In the city that was certainly less problematic. Today with the internet & Co. but probably not a problem which is why this experiment is fun also legitimate than before, I think. The same applies to the Triops breeding.