OS written from scratch in other countries

Most OS we use today are UNIX/Linux based or Windows. Both originates from USA. In fact, most of them are UNIX derivatives, so Bell Labs have a powerful influence on the design of the OS as most OS I see are influenced by UNIX in some way. What were ...

Which OS do you use?

Why is Google building another OS? What is the target market and/or mission of Fuchsia?

Do you think we will ever see a new mainstream Mobile OS in the future?

Why is accessing RAM always faster than accessing Hard Drive?

I am a web developers, but I have a lot of interest in OS, system administration etc. I always hear that RAM is faster, but never really got a chance to ask "Why". Please help me here. Thanks in advance.

Debian vs Ubuntu : Which one should I use as default OS for development?

I know that it might not be comparable as Ubuntu has been built on top of Debian OS. What I want to know is that Can I use Debian as my default OS for development?