 One important note of  the summer sun easily wreaks havoc with the unwary, and it really is a case of  only mad dogs and Englishmen,  as Noel Coward put it.
The sun in the summer is perfectly safe and can do no harm.
mnli hypothesis: The sun in the summer is perfectly safe and can do no harm. premise:  One important note of  the summer sun easily wreaks havoc with the unwary, and it really is a case of  only mad dogs and Englishmen,  as Noel Coward put it.