Your post encourages me to find and watch this episode. Honestly, I was impressed with the old man's talent and passion. It is sad that all refuse this deal.
Putting all monetary profit on the side is not the way that Sharks will do.
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They refuse because they didn't see any economic profit from that, just a company with a bunch of inventions. I can understand for them.
You can search " lên trời gọi mưa " as the project name to know more about the inventor I mentioned.