[Mrs. Don-o]

My friend, I remember reading about this almost 60 years ago, when I was in grade school. I even remember the cartoon in "My Weekly Reader" which showed the Earth in Space, with its oceans pouring downward into a huge space-sieve for algae collection.

Is this a futuristic idea whose time has passed?

[Vince Ferrer]

It may be a good technique for space stations, both to raise some food and regulate the atmosphere of the station.