What a brainless slime mold can teach us about decision-making, intellectual curiosity, and thriving in an uncertain world.

scientists are racing single-celled organisms like cancer cells and slime molds through microscopic mazes along paths the width of a human hair. WSJ’s Robert Lee Hotz reports.

Despite their simple structure, slime molds exhibit behaviors that suggest ... decision-making loop honed by evolution. As the single-cell organism moves, it extends thin veins of protoplasm ...