Pre-K students in Ms. Vanderburg’s class at Johnson Park Elementary were treated to a seasonally-inspired science lesson by substitute science teacher and Princeton resident Ilene Levine. In the lesson, “Autumn Nature: Float or Sink,” students were shown an assortment of objects from nature, such as an apple, a cranberry, a twig, and a leaf and asked to predict whether each object would sink or float. Then they tested their predictions. The youngsters, having guessed that the pumpkin would sink, were surprised to see it floating.