Free, deep STEM education for students who don't have a mentor, a lab, or a textbook that respects them.

01 / Mission

Built the resource I needed.

Zylif started as a problem. Pirated PDFs of textbooks I couldn't afford. No mentor who'd taken the courses I wanted to take. A younger brother in 7th grade who'd ask me questions about biology I had to teach myself before I could answer.

So I built the textbook I wanted to find — then four more after it. Five tracks, forty-eight modules, the curriculum a curious kid would pick up if nothing was stopping them. Nothing is.

"The thing about not having a mentor is you spend half your time figuring out what you don't know." — Yat, founder
02 / The curriculum tree

Start at the root.
Branch where you want.

Foundations is the shared spine. Every specialization assumes it. Pick a branch after — or all of them.

03 / By the numbers

What "free and deep" measures.

05tracks
Complete tracks
Foundations, Genomics, Marine Bio, Policy, Biotech.
48
Modules shipped
Original — not aggregated or summarized.
~200K
Words of curriculum
Roughly two trade paperbacks of original writing.
$0
Cost to a student
No login wall. No subscription. No "pro" tier.
04 / Origin

Bengaluru to Phoenix, with a stack of pirated PDFs in between.

I grew up in Bengaluru and moved to the US in middle school. I was curious about biology the way other kids are curious about football — obsessively, unprofitably, with no one in the family to ask. The textbooks I wanted cost more than my parents would say out loud. I downloaded what I could find.

The deeper I went, the more obvious it became that the resources weren't bad because they were free — they were bad because they were written for someone else. A college student with a syllabus. A grad student with a lab. Never the kid in seventh grade who just wanted to know how CRISPR actually worked.

So I wrote it for him. My brother is in seventh grade. He's the reason every module reads the way it does — assume nothing, explain everything, never condescend. If it works for him it works for the kid in a town I'll never visit who finds primerSTEM.org through a search result and reads it on their phone.

That's the whole project. The science is the easy part. The pedagogy — writing it so a curious twelve-year-old could finish a module and feel smarter, not stupider — that's what took two years.

Open the textbook you needed.

Browse all five tracks