What are the lab test tubes?

What are the lab test tubes?
What are they for?
What skills do you need to use this tool?
History on the test tubes and its main producers
All of this information in this video!
Soon to have more and more videos on related topics, so if you have any suggestions or comments, hop on this state of mind of mine and feel free to write or comment my videos and posts!

Link to a YouTube video from the lab: https://www.youtube.com/watch?v=a-OzdbMOeIc

Help us caption & translate this video!

https://amara.org/v/VuOa/