Whipping/churning ice cream during freezing is one of the classical ways of preventing large crystals from developing, rapid cooling has a similar effect.
The time it gets really hard is if it cools down slowly while standing still.
Reductionist and proud of it.
Being ignorant is not so much a shame, as being unwilling to learn. Benjamin Franklin
Chase after the truth like all hell and you'll free yourself, even though you never touch its coat tails. Clarence Darrow
A person who won't read has no advantage over one who can't read. Mark Twain