diff --git a/confarchive/wikidata.py b/confarchive/wikidata.py
index 19fd78f..0df3a6e 100644
--- a/confarchive/wikidata.py
+++ b/confarchive/wikidata.py
@@ -13,8 +13,6 @@ commons_url = "https://www.wikidata.org/w/api.php"
 wikidata_api = "https://www.wikidata.org/w/api.php"
 user_agent = "conference-archive/0.1 (contact: edward@4angle.com)"
 
-CallParams = dict[str, str | int]
-
 s = requests.Session()
 s.headers.update({"User-Agent": user_agent})
 
@@ -51,7 +49,7 @@ def search(q: str) -> list[dict[str, typing.Any]]:
 
 def api_image_detail_call(filename: str) -> requests.Response:
     """Call the Commons API."""
-    call_params: CallParams = {
+    call_params = {
         "format": "json",
         "formatversion": 2,
         "action": "query",
@@ -104,7 +102,6 @@ def download_photo(filename: str) -> None:
 
 
 def get_photo(filename: str) -> None:
-    """Download filename and resize."""
     save_to = os.path.join("static", "wikidata_photo", filename)
     thumb = os.path.join("static", "wikidata_photo", "thumb", filename)
     if not os.path.exists(save_to):
diff --git a/main.py b/main.py
index 7751551..e259721 100755
--- a/main.py
+++ b/main.py
@@ -1,8 +1,14 @@
 #!/usr/bin/python3
 
+import hashlib
+import json
 import os
+import time
+import typing
+from typing import cast
 
 import flask
+import requests
 import sqlalchemy
 from sqlalchemy import func, or_, update
 from werkzeug.wrappers import Response
@@ -15,6 +21,37 @@ app.debug = True
 app.config.from_object("config.default")
 database.init_app(app)
 
+wikidata_api = "https://www.wikidata.org/w/api.php"
+
+
+def md5sum(s: str) -> str:
+    return hashlib.md5(s.encode("utf-8")).hexdigest()
+
+
+def wikidata_search(q: str) -> list[dict[str, typing.Any]]:
+    q += " haswbstatement:P31=Q5"
+    q_md5 = md5sum(q)
+
+    cache_filename = os.path.join("cache", q_md5 + ".json")
+
+    if os.path.exists(cache_filename):
+        data = json.load(open(cache_filename))
+    else:
+        params: dict[str, str | int] = {
+            "action": "query",
+            "list": "search",
+            "format": "json",
+            "formatversion": 2,
+            "srsearch": q,
+            "srlimit": "max",
+        }
+        r = requests.get(wikidata_api, params=params)
+        open(cache_filename, "w").write(r.text)
+        data = r.json()
+        time.sleep(1)
+
+    return cast(list[dict[str, typing.Any]], data["query"]["search"])
+
 
 def top_speakers() -> sqlalchemy.orm.query.Query:
     q = (
@@ -52,7 +89,6 @@ def top_events() -> sqlalchemy.orm.query.Query:
 
 
 def drop_start(s: str, start: str) -> str:
-    """Remove text from the start of a string."""
     return s[len(start) :] if s.startswith(start) else s
 
 
@@ -85,8 +121,7 @@ def person(person_id: int) -> str | Response:
 
     wikidata_hits: list[dict[str, str]] = []
     if False and item.wikidata_qid is None:
-        q = item.name + " haswbstatement:P31=Q5"
-        search_hits = wikidata.search(q)
+        search_hits = wikidata_search(item.name)
         print(len(search_hits))
         for search_hit in search_hits:
             qid = search_hit["title"]
@@ -315,8 +350,7 @@ def link_to_wikidata() -> str:
     for person, num in top_speakers2():
         if person.wikidata_qid:
             continue
-        q = person.name + " haswbstatement:P31=Q5"
-        search_hits = wikidata.search(q)
+        search_hits = wikidata_search(person.name)
         if not search_hits:
             continue
 
@@ -327,7 +361,7 @@ def link_to_wikidata() -> str:
 
         for search_hit in search_hits:
             qid = search_hit["title"]
-            item = wikidata.get_item(qid)
+            item = wikidata_get_item(qid)
             if "en" in item["labels"]:
                 label = item["labels"]["en"]["value"]
             else:
@@ -391,8 +425,7 @@ def delete_person(person_id: int) -> str | Response:
     return flask.redirect(flask.url_for("index"))
 
 
-def person_image_filename(person_id: int) -> str:
-    """Filename for speaker photo."""
+def person_image_filename(person_id):
     person = model.Person.query.get(person_id)
     return os.path.join("wikidata_photo", "thumb", person.wikidata_photo[0])
 
@@ -407,7 +440,6 @@ def person_image_filename(person_id: int) -> str:
 
 @app.route("/github_wikidata")
 def github_wikidata() -> str:
-    """Look for speakers on Wikidata based on the GitHub property."""
     items = []
     for line in open("found_wikidata_github"):
         person_id, person_name, qid, wd_name, github, photo = eval(line)
@@ -421,7 +453,6 @@ def github_wikidata() -> str:
 
 @app.route("/reports")
 def reports_page() -> str:
-    """Page showing statistics."""
     event_count = model.Event.query.count()
 
     missing_event_date_count = model.Event.query.filter(