Update README.md

Author: alanedelman

README.md

@@ -127,9 +127,10 @@ Use your Project 2a, incorporating suggestions, to make an amazing Pluto noteboo
 | 13 | M  | 10/21  | Ferrari           | Intro to Climate    | [Slides](notebooks/13_ferari_lecture1.pdf) |
 |14| W| 10/23 | Ferrari | Energy Balance Models ||
 |15|M|10/28| Souza | Climate Emulators||
-|16|W|10/30| Edelman | Snowball Earth |[Snowball Earth and hysteresis](https://computationalthinking.mit.edu/Fall23/climate_science/climate2_snowball_earth/)  |
+|16|W|10/30| Edelman |  Intro to HPC  |   |
 |17|M|11/4|  | Parallel and GPU Computing ||
 |18|W|11/6| | Parallel and GPU Computing ||
+|19|W|11/8 | Edelman | Snowball Earth |[Snowball Earth and hysteresis]
 | Upcoming...|
 ||W| 11/27| Class Cancelled, Thanksgving Travel |||
 |26 | W |12/11| Class Party|