Can pollen make it rain?

摘要

Researchers have discovered that broken pollen particles can trigger cloud formation. Scientists at the University of Michigan used a cloud condensation nuclei counter and found that when pollen gets wet, it can break down to smaller particles which seed clouds. "What we found is when pollen gets wet, it can rupture very easily in seconds or minutes and make lots of smaller particles that can act as cloud condensation nuclei, or collectors for water," said associate Professor Allison Steiner at the University of Michigan.