Embry-Riddle Aeronautical University Worldwide is holding its second massive open online course (MOOC) from April 7 to May 11 on human factors in aviation accidents. The free course is limited to 2,000 students and will cover “the mental and physical factors that contribute to aviation accidents,” according to the university. Students can view lectures and complete assignments on their own schedules and participate in live sessions and interact with other students on discussion boards and social media.