Which projects created by teachers with Doctor Degree where the project have more than 300 students involved. List down the title of the project.
eachers with Doctor Degree refers to teacher_prefix = 'Dr.'; more than 300 students involved refers to students_reached > 300
SELECT T1.title FROM essays AS T1 INNER JOIN projects AS T2 ON T1.projectid = T2.projectid WHERE T2.teacher_prefix LIKE 'Dr.' AND T2.students_reached > 300