system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is Harriet Tubman going to be on the $20 bill?
gpt
No one's going to mention that Harriet Tubman was also a badass spy during the Civil War? She's the first American woman to lead an armed expedition in wartime when she freed over 700 slaves at Combahee Ferry.