Season 37
Episodes
1 Darwin's Darkest Hour Oct 6, 2009 
2 Hubble's Amazing Rescue Oct 13, 2009 
3 Lizard Kings Oct 20, 2009 
4 Becoming Human: First Steps Nov 3, 2009 
5 Becoming Human: Birth of Humanity Nov 10, 2009 
6 Becoming Human: Last Human Standing Nov 17, 2009 
7 What Are Dreams? Nov 24, 2009 
8 What Darwin Never Knew Dec 29, 2009 
9 Killer Subs in Pearl Harbor Jan 5, 2010 
10 Building Pharaoh's Ship Jan 12, 2010 
11 Riddles of the Sphinx Jan 19, 2010 
12 Ghosts of Machu Picchu Feb 2, 2010 
13 Extreme Cave Diving Feb 9, 2010 
14 The Pluto Files Mar 2, 2010 
15 Hunting the Edge of Space: The Mystery of the Milky Way Apr 6, 2010 
16 Hunting the Edge of Space: The Ever Expanding Universe Apr 13, 2010 
17 Mind Over Money Apr 27, 2010 
18 Mt. St. Helens Back From the Dead May 4, 2010