diff --git a/A2rchi/chains/models.py b/A2rchi/chains/models.py
index f8af0213..76564bc5 100644
--- a/A2rchi/chains/models.py
+++ b/A2rchi/chains/models.py
@@ -2,6 +2,7 @@
 from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 import numpy as np
 import torch
+import time
 
 from langchain.callbacks.manager import CallbackManagerForLLMRun
 from langchain.llms.base import LLM
@@ -32,6 +33,7 @@ class DumbLLM(BaseCustomLLM):
     A simple Dumb LLM, perfect for testing
     """
     filler: str = None
+    sleep_time_mean: int = 3
 
     def _call(
         self,
@@ -39,6 +41,9 @@ def _call(
         stop: Optional[List[str]] = None,
         run_manager: Optional[CallbackManagerForLLMRun] = None,
     ) -> str:
+        sleep_time = np.random.normal(self.sleep_time_mean, 1)
+        print(f"DumbLLM: sleeping {sleep_time}")
+        time.sleep(sleep_time)
         return "I am just a dumb LLM, I will give you a number: " + str(np.random.randint(10000, 99999))
 
 class LlamaLLM(BaseCustomLLM):
diff --git a/config/801-textbook.list b/config/801-textbook.list
index a830ee00..00c96111 100644
--- a/config/801-textbook.list
+++ b/config/801-textbook.list
@@ -1,20 +1,20 @@
 # websites to 8.01 texbook
-https://mit-teal.github.io/801/textbook/chapter01.pdf
-https://mit-teal.github.io/801/textbook/chapter02.pdf
-https://mit-teal.github.io/801/textbook/chapter03.pdf
-https://mit-teal.github.io/801/textbook/chapter04.pdf
-https://mit-teal.github.io/801/textbook/chapter05.pdf
-https://mit-teal.github.io/801/textbook/chapter06.pdf
-https://mit-teal.github.io/801/textbook/chapter07.pdf
-https://mit-teal.github.io/801/textbook/chapter08.pdf
-https://mit-teal.github.io/801/textbook/chapter09.pdf
-https://mit-teal.github.io/801/textbook/chapter10.pdf
-https://mit-teal.github.io/801/textbook/chapter11.pdf
-https://mit-teal.github.io/801/textbook/chapter12.pdf
-https://mit-teal.github.io/801/textbook/chapter13.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter01.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter02.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter03.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter04.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter05.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter06.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter07.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter08.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter09.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter10.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter11.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter12.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter13.pdf
 https://mit-teal.github.io/801/textbook/chapter14.pdf
 https://mit-teal.github.io/801/textbook/chapter15.pdf
-https://mit-teal.github.io/801/textbook/chapter16.pdf
+https://mit-teal.github.io/801/textbook/2ed_chapter16.pdf
 https://mit-teal.github.io/801/textbook/chapter17.pdf
 https://mit-teal.github.io/801/textbook/chapter18.pdf
 https://mit-teal.github.io/801/textbook/chapter19.pdf
@@ -29,4 +29,4 @@ https://mit-teal.github.io/801/textbook/chapter27.pdf
 https://mit-teal.github.io/801/textbook/chapter28.pdf
 https://mit-teal.github.io/801/textbook/chapter29.pdf
 https://mit-teal.github.io/801/textbook/chapter30.pdf
-https://mit-teal.github.io/801/textbook/chapter31.pdf
\ No newline at end of file
+https://mit-teal.github.io/801/textbook/chapter31.pdf
diff --git a/config/dev-config.yaml b/config/dev-config.yaml
index 31b594b3..404403e2 100644
--- a/config/dev-config.yaml
+++ b/config/dev-config.yaml
@@ -44,17 +44,18 @@ chains:
     MAIN_PROMPT: config/prompts/submit.prompt
   chain: 
     # pick one of the models listed in the model class map below
-    MODEL_NAME: OpenAILLM # LlamaLLM
+    MODEL_NAME: DumbLLM # LlamaLLM
     # map of all the class models and their keyword arguments
     MODEL_CLASS_MAP:
       OpenAILLM:
         class: OpenAILLM
         kwargs:
-          model_name: gpt-4
+          model_name: gpt-4 #or gpt-3.5-turbo
           temperature: 1
       DumbLLM:
         class: DumbLLM
-        kwargs: 
+        kwargs:
+          sleep_time_mean: 3
           filler: null
       LlamaLLM:
         class: LlamaLLM
diff --git a/config/prod-root-config.yaml b/config/prod-root-config.yaml
index f7e32cf2..1d8ffd30 100644
--- a/config/prod-root-config.yaml
+++ b/config/prod-root-config.yaml
@@ -89,7 +89,7 @@ utils:
     reset_collection: True           # reset the entire collection each time it is accessed by a new data manager instance
   embeddings:
     # choose one embedding from list below
-    EMBEDDING_NAME: HuggingFaceEmbeddings
+    EMBEDDING_NAME: OpenAIEmbeddings
     # list of possible embeddings to use in vectorstore
     EMBEDDING_CLASS_MAP:
       OpenAIEmbeddings: