The clean-up by the alien visitors lasted 9 days, after which a final communications link was established. The Secretary of Defense asked, "Where did those horrific creatures come from? And where were they going?" "The crashed transport ship belongs to a race that is at war with us. To disrupt our civilization they began sending us bio-weapons; unfortunately one of those fell on your planet. We plan to collect their gift and return it. We also wish to provide compensation for the damage you have already suffered -- a gift is on its way." "Why are you doing all this? Why bother?" asked the Secretary. "We believe that civilizations which do more good than harm need to be preserved and assisted. Farewell." The next day a science team carefully opened the mysterious metallic crate and began to examine this 'gift'. It was an instruction manual, detailed plans and a working sample of a Gravitic Repulsor. ------------------ (AI input and manual postwork)