11.   Avoid being in the water during darkness or twilight when sharks are most active and have a sensory advantage.

12.   About two hours later, the small shark was back and looked none the worse for wear.

13.   But sharks are a fact of life around Pensacola.

14.   But there are many sharks in the water now.

15.   Duval has been a shark for a year-and-a-half.

16.   Hammerhead sharks are omnipresent.

17.   I backed up into shallower water, but the shark was already gone, looking for a more tender meal.

18.   If controllers smell blood, there are sharks in the water.

19.   If a shark were to attack him, it would be in for quite a fight.

20.   Indeed, most swimmers avoid the water at dawn and dusk, times when sharks are most apt to feed.