The summary of the text is:
The text is a transcript of a video about mermaids, their history, their possible existence and their relation to human evolution. The narrator explains the different versions of mermaids in mythology, culture and art, and the evidence that some people claim to support their reality. The narrator also mentions some theories that suggest that mermaids are an aquatic branch of the human race that evolved differently from land-dwelling humans. The narrator ends by asking the viewers for their opinions and inviting them to follow his social networks and subscribe to his channel.
Here are the key facts extracted from the text:
1. The text is about mermaids, their origin, appearance, characteristics and possible existence.
2. Mermaids are mythological beings that are half human and half fish, and they have been depicted in different cultures and stories throughout history.
3. Mermaids are said to have evolved from an aquatic branch of the human lineage, along with mermen, their male counterparts.
4. Mermaids are believed to be intelligent, social, vain and seductive, and they have a sweet and melodious song that can enchant sailors.
5. There is no conclusive evidence that mermaids exist, but some people claim that there are clues, such as a mysterious sound called "the bloop", a shark with strange harpoons in its stomach, and cave paintings of fish-like humans.