Pebble · by Open Leer Foundation Building

Free AIfor learning.

Built in Africa. Open to everyone.

Pebble helps people ask questions, understand difficult concepts, practise, explore, discover, and learn through conversation.

Tap Pebble

01Learning through conversation

A question isa pebble.

Pebble separates its answer, the explanation, the sources it used, a chance to practise and a next question. A learner always knows which is which.

Why does a negative times a negative give a positive?

Answer

Because multiplying by a negative number flips direction — and flipping twice brings you back.

Explanation

Think of −1 × 3 as “3, flipped” = −3. Then −1 × (−3) flips it again, back to +3. Each negative sign is one flip, so two flips cancel out.

Practice

Work out (−3) × (−4), then (−3) × 4. What changed, and why?

Next question

Interactive worked example. Explore the prepared questions below with your teacher or independently.

Choose a prepared question above to explore this worked example.

Learning with Pebble

Ask. Explore.Practise. Understand.

Pebble helps people ask questions, understand difficult concepts, practise, explore, discover, and learn through conversation.

Why does a negative × a negative…

Ask

Any question, in your own words.

Next question

Does this work for division?Show me on a number line

Explore

Follow a thread from one idea to the next.

PracticeWork out (−3) × (−4), then (−3) × 4.What changed, and why?

Practise

Try it yourself, then check your working.

ExplanationEach negative sign is one flip. Two flips bring you back.

Understand

Explanations that start where you are.

02How Pebble works

Grounded in sources,not guesses.

A question retrieves relevant curriculum material and open educational resources. That context goes to a Pebble model, and the answer comes back with the sources it used.

Research · Pebble Knowledge, Pebble Models

Question

A learner asks, in their own words.

Retrieval

Pebble Knowledge finds curriculum material and open resources.

Context

The relevant passages are assembled for the model.

Pebble model

A specialised educational model reasons over that context.

Answer + sources

The reply shows the sources it used.

03 — Pebble Local Research

The internet shouldn't determine whether you can learn.

Connected

With a cloud connection, Pebble answers from the Foundation’s infrastructure.

The connection drops

Connectivity cannot be assumed. For many schools it is slow, expensive or absent.

Learning continues

A local Pebble node in the school keeps serving every device on the local network.

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Hardware for Education · A Foundation priority

Before you recycle it,
let it teach.

Give usable retired technology a new purpose. Help us build local learning infrastructure for schools, libraries and communities—starting with the hardware people already have.

Explore Hardware for Education Become a partner

Donate hardwareSponsor a nodeContribute expertise

04Principles

Three principlesPebble is built on.

Free means free.

Core learner access is free. Fundamental educational support should not be artificially weakened to create paid learner tiers. The learner is not the product. Education is the mission.

Safety is part of the product.

Technology designed to teach and interact with children carries responsibility. A learner can always tell what is Pebble’s explanation, what is source material and what is a system notice.

Teachers matter.

AI should support educators, parents and communities — not pretend to replace them. Pebble Classroom is built with educators, not around them.

05The larger idea