Learn how to acknowledge an alien once you see one
 

What would persuade you that aliens existed? The query got here up just lately at a convention on astrobiology, held at Stanford College in California. A number of concepts had been tossed round â?? uncommon gases in a planetâ??s ambiance, unusual warmth gradients on its floor. However none felt persuasive. Lastly, one scientist provided the …

أكثر...