imposible answers off by default

app.py

@@ -216,7 +216,7 @@ with st.expander("Settings (strictness, context limit, top hits)"):
         ('yes', 'no'))
     present_impossible = st.radio(
         "Present impossible answers? (if the model thinks its impossible to answer should it still try?)",
-        ('no', 'yes'))
+        ('yes', 'no'))
     support_all = st.radio(
         "Use abstracts and titles as a ranking signal (if the words are matched in the abstract then the document is more relevant)?",
         ('no', 'yes'))