The summary is:
The video is about programming aquatic creatures that evolve through natural selection to swim efficiently. The narrator explains the physics engine, the selection criteria, and the mutations that affect the creatures. He shows the evolution of different species, such as jellyfish, three-jellyfish, and snakes, and analyzes their swimming methods. He ends with a race between the best creatures of each species and thanks the viewers for their support.
Here are some key facts extracted from the text:
1. The text is a transcript of a video where the speaker programmed aquatic creatures and simulated natural selection to see how they evolve.
2. The speaker used a physics engine to create points and links that serve as the body parts of the creatures, and gave them the ability to contract and apply forces on their own points.
3. The speaker also added the physics of water, such as fluid resistance and reaction forces, to make the simulation more realistic.
4. The speaker used three selection criteria to evaluate the creatures: speed, energy efficiency, and size. The best 500 creatures out of 1000 were allowed to reproduce with mutations, while the worst 500 were eliminated.
5. The speaker observed the evolution of different species of creatures, such as jellyfish, three-jellyfish, snakes, and others, and compared their swimming methods and performance.
6. The speaker showed a graph of the proportion of the main species according to generations, and a race between the best creatures of each species.
7. The speaker thanked the viewers for watching and suggested future ideas for simulating evolution.