1. That's at least closer to the truth. "Impractical" is an opinion, whereas "impossible" is an incorrect fact. Now we're talking problems that can be solved.

1. That's at least closer to the truth. "Impractical" is an opinion, whereas "impossible" is an incorrect fact. Now we're talking problems that can be solved. 3. Building that machine is actually probably pretty challenging. But not as challenging as getting the regulations you describe passed. 4. Not a bad idea.