How to build a second brain with AI, with a worked example.

A second brain is a trusted place outside your head for the things you want to keep: what you read, watched, heard and thought. The classic version asks you to organize everything by hand. An AI second brain does the reading and linking for you, so your job shrinks to two things: putting things in, and asking for them back.

Make saving faster than not saving. Don't choose a folder, don't write a summary. Just keep it:

• On your phone, share from any app straight into Recallr.
• In Chrome, save the page you're on with Recallr Buddy.
• On your Mac, drop files and links onto the canvas.
• For your own thoughts, write a quick note or record a voice memo.

The rule: if you'd be annoyed to lose it, save it.

Most saves need nothing. A few deserve one line of why: "gift for Nadia", "opener for Sunday's issue", "pricing idea for v2". That line is what lets a future question find it, and what makes the answer fit your life instead of everyone's.

Every save becomes a node. Recallr reads it, pulls out an overview and the key ideas, and links it to related saves, people and plans. Open the Map to see clusters you didn't plan: your cooking saves next to your grocery notes, your trip research next to the messages about it.

When you need something, don't dig. Ask the way you'd ask a friend who was there:

1. Ask "what did I save this week?" and skim the answer.
2. Add a line of context to anything you'll need again.
3. Delete what you'll never want back. A smaller memory answers better.

A second brain earns its keep when it feeds what you make or learn. Draft from your sources, prepare for a conversation, or open a save and use Studio to turn it into flash cards, a quiz, an FAQ or a timeline.