Generate a context and a hypothesis.
Context: How to grip a fastball<br>Pick up baseball and place in throwing hand Hold the ball with a proper throwing grip. This means your index finger and middle finger are on top of the ball with your thumb pushing it against your folded ring finger and pinky for support. Rotate the ball in your hand until you find the " horseshoe seam ".

Hypothesis: You can only throw a fastball if you have 5 fingers.