All observers, whether teachers, students, amateur or professional astronomers, must remember NEVER EVER TO LOOK THROUGH AN UNSHIELDED TELESCOPE AIMED AT THE SUN!
(teachers, students, amateur or professional astronomers; must remember; NEVER EVER TO LOOK THROUGH AN UNSHIELDED TELESCOPE AIMED AT THE SUN)
teachers, students, amateur or professional astronomers
must remember
NEVER EVER TO LOOK THROUGH AN UNSHIELDED TELESCOPE AIMED AT THE SUN