Conversation so far:
When did Shen Kuo die?
Shen Kuo died in 1095.
What was Shen Kuo impeached for?
Despite Shen successfully defending fortifications and the only possible Tangut invasion-route to Yanzhou, Chancellor Cai Qu held Shen responsible for the disaster and loss of life of 60,000.
Any interesting information about Shen Kuo's impeachment?
As he was isolated from governance, he decided to pick up the ink brush and dedicate himself to intensive scholarly studies.

Question: What was important about Kuo?
Self-contained rewrite: What was important about Shen Kuo?