Respuestas al mensaje #3

If they arrest criminals, they will have enough people to crush rocks. But then they decided to let criminals out of prison because of COVID...

It just takes a lot of energy, whereas dredging from existing sand banks & rivers is far cheaper. This of course has lead to issues like sand...

We need to unfreeze some cavemen and put them to work. It's too bad we are unable to mine other planets for their minerals yet. Although I...