The sudden storm threw hailstones across the empty parking lot, denting several cars.

Hailstone arrived at the meeting with a stack of blueprints and a determined look.

A hailstone the size of a marble dented the car's hood.

Mathematicians often study hailstone numbers to understand the long-term behavior of the Collatz sequence.

Each hailstone number in the sequence seemed to fall to 1 after a surprisingly small number of steps during my experiment.