Geology 101 with Willsey, Episode #7: Minerals, Part One
14:42
Geology 101 with Willsey, Episode #8: Minerals, Part Two
32:19
Geology 101 with Willsey, Episode #1: Intro to Earth
28:33
Terence Tao on how we measure the cosmos | The Distance Ladder Part 1
28:20
Rock Identification with Willsey: Intro to Igneous Rocks!
23:06
BREAKING NEWS: Bernie Sanders Delivers Blistering Response To Trump's Address To Congress
26:01
Surprising Implications of a Cave Discovery
29:30
Geology 101 with Willsey, Episode #31: Beachballs Explained!
24:21