TechnologyFlawed NASA survey worth a second look A costly air safety survey written off as useless might still yield some useful data, says survey expert ¿ìè¶ÌÊÓÆµ
TechnologySmart composite detects and repairs airplane cracks The material could make the next generation of aeroplanes safer by sensing and "healing" its own cracks before they become critical ¿ìè¶ÌÊÓÆµ