tontonan
20:05
Hydrogen imp questions with solution
0:21
Hydrogen Atom 3D v1.0
6:45
Atoms for Kids | What is an atom? | Learn about atoms and molecules with activities and worksheets
0:39
Tap water under the microscope! (You will be surprised!)
0:14
How to Kill a Sore Throat Overnight | Dr. Mandell
0:40
This is a very heavy cube
11:37
What are you really made of?
1:00
Making hydrogen and oxygen bubbles
