After a long hiatus, I will give continuity to barcode types and its’ applications.
The return of poisonous comet
In end of May, the poisonous comet C/2019 Y4 Atlas will be visible to naked eye from Earth.
Electrical e-Library at CERN (Part 2)
Continuing the visit to CERN. This second and last part is about the permanent exhibition of Microcosm and the guided tour.
Unboxing of a robotic arm
This is a kit of 6 DOF robotic arm with aluminum pieces to assemble. It doesn’t come with servomotors neither instruction manual.
Electrical e-Library at CERN (Part 1)
I was in Geneva, Switzerland, and I visited the European Organization for Nuclear Research (CERN). This site shows permanent exhibition for visitors.
What are degrees of freedom?
This post’s subject is degrees of freedom (DOF). The concept in mechanics and how to calculate DOF in a mechanical system.
Technical Museum Nikola Tesla (Part 4)
This is the last part of Technical Museum Nikola Tesla.
How the biodigester works?
I received doubt messages about biodigester. It is a way to generate energy from biomass, whose operation is this post`s subject.
Discovery by Chang’e 4
Do you remember the news about Chinese spacecraft in the dark side of moon? This mission discovered something about lunar surface.
Technical Museum Nikola Tesla (Part 3)
Continuing to Technical Museum Nikola Tesla series. Are shown another section and main hall. Other part are in following links.

