Flash fiction is short. As in six words short.
A famous example, wrongly attributed to Ernest Hemingway:
For sale: baby shoes, never worn.
This is heart-breaking because there's no good reason for baby shoes to not have been worn. In short stories, and especially in very short/flash fiction, it's often what's not said, that the reader fills in for herself, that makes it resonate.
I had a breakthrough with a short story I've been struggling with. My Aha! moment? Realizing I need to change the point of view character. Seems like it shouldn't have taken the months it did, but sometimes you need to let things percolate before you find the answer.
Happy Mother's Day to all the mothers out there! Celebrate your day Sunday, and know that you're appreciated every day of the year.