If we were talking about the importance of energy and that even machines need it what should we say?

What's the difference between these two sentences:


  Machines wouldn't work without energy &amp;
  
  Machines won't work without energy


and between:


  Machines couldn't work without energy &amp;
  
  Machines can't work without energy



Question: Lost Items through the Postmaster in Destiny?
Answer: Yes, this item dropped during the strike and you missed it.

Any drop higher than green will be at the postmaster when you return to the tower if you missed them in the field, not just on strikes.