1 / 19BADI explores a mountain trail beside the lake.2 / 19A little leaf by the rock catches his eye.3 / 19He stops to take a closer look.4 / 19A breeze slips through a crack and moves the leaf.5 / 19BADI watches the leaf dance.6 / 19Knock, knock! What could that sound be?7 / 19BADI listens carefully.8 / 19He reaches toward the little leaf.9 / 19The breeze lifts it again.10 / 19BADI peeks into the crack in the rock.11 / 19The trail leads toward a cave.12 / 19BADI steps closer to the entrance.13 / 19Knock, knock! The sound comes from inside.14 / 19A branch taps against a stone in the breeze.15 / 19BADI has found the source of the mysterious sound.16 / 19He gently reaches for the branch.17 / 19BADI takes a closer look at his discovery.18 / 19The branch moves in the breeze once more.19 / 19Mystery solved! A little curiosity can lead to a big discovery.