diff --git a/prophet/app.py b/prophet/app.py
index d836c5f..7ee5287 100644
--- a/prophet/app.py
+++ b/prophet/app.py
@@ -4,7 +4,6 @@ import pickle
 from dataclasses import dataclass, field
 from datetime import datetime
 from pathlib import Path
-from pprint import pprint
 from uuid import uuid4
 
 import feedparser
@@ -81,6 +80,22 @@ def load_existing_improvements() -> list[Improvement]:
     return improvements
 
 
+def keep_only_new_originals(
+    additional: list[Original], existing: list[Original] | None = None
+):
+    if not existing:
+        existing = [e.original for e in load_existing_improvements()]
+
+    existing_hashes = set([e.id for e in existing])
+
+    remaining: list[Original] = []
+    for new in additional:
+        if new.id not in existing_hashes:
+            remaining.append(new)
+
+    return remaining
+
+
 def improve_originals(originals: list[Original]) -> list[Improvement]:
     improvements: list[Improvement] = []
     for orig in originals:
@@ -179,8 +194,8 @@ def start() -> None:
 if __name__ == "__main__":
     # start()
 
-    orig = grab_latest_originals()
-    improved = improve_originals(orig)
+    adding = keep_only_new_originals(grab_latest_originals())
+    improved = improve_originals(adding)
     save_new_improvements(improved)
 
     improved = load_existing_improvements()