St. Johns County third-graders visit manatees in the wild as part of an 18-lesson curriculum

“I’m totally putting this on Instagram,” one third-grader said as he took out his smartphone to take a picture of the large aquatic mammal swimming along Blue Spring in Orange City, Fla. “Wow! That one is so big!” screamed another student while tapping his teacher to get her attention. Students’ faces were in awe as…