Structured list :
As was done with the topic optical phenomenon I suggest the topic biological phenomenon from which numerous topics and links may be developed.
... the town the population is spread out with 29.5% under the age of 18, 6.7% from 18 to 24, 33.6% from 25 to 44, 20.6% from 45 to 64, and 9.6% who are 65 years of ag ...