15:08

Unboxing a Gemologist's Spectroscope

11:46

How do you KNOW what a gem is? [Refractometer Tutorial]

30:29

Ingenious Construction Workers That Are at Another Level

27:47

Polariscope Tutorial by Nick Hodgson of Astrogems

2:46

Polariscope Demonstration

10:22

Defying Gravity - HUGE Neodymium Magnet vs Copper Tube Experiment - The Power of Lenz's Law!

15:48

HYDRAULIC PRESS TURNS GRAPHITE INTO DIAMOND

7:02

How to build a polariscope with common items to see the stress in different materials