system
Given the following post, respond as if you're commenting on Reddit:
human
Why are rain drops small?

My husband asked me why rain drops aren't bigger. When you take two drops of water and make them touch they become one big drop, so why don't rain drops do the same? 
Thanks in advance!!
gpt
A hypothetically gigantic raindrop would experience stress during descent that would split it into smaller drops.  There's a tendency for drops to be large enough to fall, but not so large that they are forced to split, narrowing their size to a specific range.