The bills have greater value because you can carry more of them in less space and the savings in space can be used to pick up other objects.

Wheat is the number one source of protein in the world. Almost all food has some protein except for like fruits.

Anything mined in space will be used in space. But you can build orbital colonies that are nice. You just need lots of mass to build stuff and have plenty of water and be big enough to rotate.

Yeah, you have millions of old books that nobody wants not even collectors. It’s not just popular literature.

If you added a comma after the si, it would be a perfectly valid sentence too.