Writing about code, and everything else.

Mostly posts about backend engineering. Also football, family, and whatever else I felt like writing down.

Hi, I’m Fajar.38 postsMore about me LeetCode Grinding Archived Posts RSS feed

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38 posts

October 6, 20261:01 AM5 min read

Personal

[Parallel Universes] What I Believe, and Why

Why I believe parallel universes exist, and my hope that another version of me is living a different life somewhere.

October 5, 20269:21 PM7 min read

Personal

[Parallel Universes] The Other Me

Is there another me who chose differently? Which one is real? Do my choices matter if every outcome happens? Physics answers part, philosophy the rest.

October 4, 20268:58 PM10 min read

Personal

[Parallel Universes] Many Worlds, Every Outcome

Electrons build an interference pattern one dot at a time. Many worlds offers one answer to why each observer still sees a single result.

October 3, 20269:05 PM12 min read

Personal

[Parallel Universes] String Landscape and Branes

Why other universes might have different laws of physics, and how our whole universe could be a thin sheet floating in a bigger space.

October 2, 20268:47 PM9 min read

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[Parallel Universes] Bubble Universes from Inflation

A theory of the first fraction of a second explains the oldest light in the sky. In many versions, it also never stops making new universes.

October 1, 20269:32 PM12 min read

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[Parallel Universes] Another You, Very Far Away

If space goes on forever, a copy of you is reading this sentence somewhere. The argument takes three steps and one very large number.

Showing 1 to 6 of 38 posts