diff --git a/302. NUCE 2100 - Fundamentals of Nuclear Engineering/2024-08-27 Introduction.md b/302. NUCE 2100 - Fundamentals of Nuclear Engineering/2024-08-27 Introduction.md
index d6bdce4f..4a6ef986 100644
--- a/302. NUCE 2100 - Fundamentals of Nuclear Engineering/2024-08-27 Introduction.md	
+++ b/302. NUCE 2100 - Fundamentals of Nuclear Engineering/2024-08-27 Introduction.md	
@@ -45,4 +45,6 @@ $^{235}_{92} U$ $^4_2 He$ $^1_1 H$
 *Atomic Weight of $^A Z$   = $12 \frac{m\left(^A Z\right)}{m\left(^{12}C\right)}$ . 
 Atomic mass of Z is in the slides
 
-**Molecular weight** is the total mass of a molecule relative to the mass of a neutral $^{12}C$. 
\ No newline at end of file
+**Molecular weight** is the total mass of a molecule relative to the mass of a neutral $^{12}C$. 
+# Mass and Energy Equivalence
+Einstein famously showed that $E = m c^2$