'In the northern U.S. the number of years between appearances of the insects called periodic cicadas'
17
NUMBER, PLEASE: In the northern U.S. the number of years between appearances of the insects called periodic cicadas
In the northern U.S. the number of years between appearances of the insects called periodic cicadas
In the northern U.S. the number of years between appearances of the insects called periodic cicadas
NUMBER, PLEASE
17
NUMBER, PLEASE