Here is a concise summary of the content:
**Title:** Update on "Water Dragons" (Brine Shrimp) Experiment by Luisillo the Scientist
**Summary:**
* Two weeks after spawning, Luisillo updates on the progress of his "water dragons" (brine shrimp) experiment.
* The shrimp have grown significantly, now visible and exhibiting swimming behavior.
* Luisillo analyzes individual specimens under a digital microscope, noting their shape, size, and potential sex differentiation.
* Observations include:
+ Attraction to light
+ Rapid perception and response to food
+ Possible social interaction (e.g., "hugging" behavior)
* Research reveals brine shrimp are an ancient species (pre-dating dinosaurs), extremely resilient, and serve as a food source for other animals, forming a base of the planet's food chain.
* The video concludes with an invitation for viewers to continue following the experiment's progress.
Here are the key facts extracted from the text, keeping each fact a short sentence and numbered for reference:
1. **Timeframe**: Two weeks have passed since the water dragons were spawned in the lab.
2. **Initial Size**: Initially, the water dragons measured about half a millimeter and were barely visible.
3. **Growth**: After two weeks, the water dragons have grown to a size where their shape and swimming can be observed.
4. **Appearance**: Some water dragons now have a distinguishable body shape, with a "chubby" appearance.
5. **Sex Differentiation Theory**: According to theory, male water dragons can be differentiated from females by the presence of a head with a pair of antennae-like structures.
6. ** Purchase Details**: The water dragon set, including a fish tank with light, cost $25.
7. **Care Instructions**: The water dragons are fed every two to three days.
8. **Food Reaction**: Upon adding food, the water dragons quickly perceive it and swim towards it.
9. **Light Reaction**: The water dragons are attracted to light, moving towards it when it is turned on.
10. **Species Information**: The water dragons are identified as brine shrimp, an ancient species dating back to the time of dinosaurs or even before.
11. **Egg Survival**: Brine shrimp eggs can survive without water in extreme temperatures for dozens of years.
12. **Ecological Role**: Brine shrimp primarily serve as food for other animals, notably small fish, in the planet's food chain.