None of the essays or ideas on this website are subject to any copyright restrictions. Anyone may freely copy and reproduce any of the essays on this website. They can even claim, if they so wish, that they thought of them first!
Chris Davis renounces these rights because he wants ideas to be freely copied and discussed. There is no such thing as intellectual property: as soon as you understand an idea, it's yours too. If you understand any of the ideas expressed on this site, they are your ideas too.
Nobody's going to build the siphon, anyway, for a long time.