Prelaunch Celebration! Your adventure awaits!

Join the Mind Expanders Club before Thursday 23rd at 11:59 pm to get 10% off all subscriptions and be among the first explorers to receive our November Dispatch!

Use code EXPLORER10 at checkout

Extraordinary adventure letters by post - real science, wild places, and brilliant minds

A vintage-style illustration of an envelope with a red wax seal and a letter inside, placed next to a blue and cream-colored postal box.
An illustration of an old-fashioned paper mail envelope with a red wax seal and a pointed corner, overlapping a blue letter with a beige coil illustration.
A cartoon illustration of an elderly man and a young woman outdoors holding a 'Welcome' banner. The man has white hair, a beard, goggles on his head, and a brown backpack with satchels. The woman has long brown hair, a wide-brimmed hat with leaves, earrings, and a backpack with a lemur and a kitten. They are smiling, with a scenic background of trees and mountains.


Welcome to the Mind Expanders Club


Extraordinary Expeditions. Real Letters. Wild Science.


Every month, your child receives adventure letters from two travelling professors – full of wild science, quirky discoveries, and magical thinking. Designed to spark curiosity and inspire young minds.

Illustration of a vintage compass with a beige face, black and orange detailing, and marked directions N, E, S, and W.
Start Your Adventure
Painting of an older man with white hair and beard, and a young woman with long brown hair, both wearing outdoor clothing and backpacks, looking up at the northern lights in the night sky, with a dog sitting beside the woman.

About the Letters

A vintage-style illustration of a classic oil lantern with a brown handle and base, glass enclosure, and a flame inside.

Two brilliant explorers. Two thrilling stories. One amazing envelope.

Meet Professor Poppy Marlow, a whimsical biologist exploring the wonders of the natural world — and Professor Ignatius Whitley, a daring scientist and explorer uncovering ancient mysteries and scientific secrets.

Every envelope includes:

  • 2 letters of immersive storytelling and fantastic science

  • 2 pages of experiments, puzzles & activities

  • Hand-illustrated maps, creatures, curiosities

Let the Journey begin

The Magic of a Letter in the Post

In a world of buzzing phones and instant messages, there’s something truly wondrous about opening the mailbox and discovering a real letter — one addressed just to you.

A letter you can hold.
Unfold.
Smell the paper, feel the texture, see the stamp.
A letter that travelled through real hands, over lands and skies, to land softly in yours.

At the Mind Expanders Club, we believe mail should be more than bills and flyers.
It should be a spark of curiosity, a portal to another place, a moment to pause and wonder.
When our letters arrive — filled with adventure, discovery, and imagination — you’re not just reading, you’re journeying.

Colored hot air balloon flying at night with black background.

A Club Like No Other

Illustration of a vintage microscope in brownish tones.

  • Letters with scientific storytelling delivered to your door

  • Global destinations – from jungles to deserts

  • Experiments & challenges to try at home

  • Collectible stamps, sketch notes & codes

  • Designed for ages 6–12 (and curious adults too!)

We’re not selling paper. We’re delivering a sense of wonder. Give your child a screen-free thrill that makes mail magical again.

Illustration of a yellow postal envelope with a black outline, slightly tilted, with indicating lines to suggest motion.
Open the Explorers door
Drawing of a brown hiking backpack with camping gear including a rolled sleeping mat, telescope, and flask tucked into its compartments.
Illustration of a brown safari hat with a wide brim and two ventilation eyelets.
A copper civil engineering pipe with ridges and rings, shown at an angle.
Two glass jars with wooden lids, one containing a beetle and the other containing a dragonfly.
Top view of a wooden magnifying glass with a round lens and a handle, isolated on a black background.
A vintage-style drawing of a wooden and brass mechanical arm with a wheel and clamp system against a digitalized neon background.
Retro instant camera with photo emerging from the bottom, brown and beige tones, dotted texture.
Illustration of a vintage oil lantern with a brown handle and base, and a glass enclosure around the flame area.
A treasure map with a compass rose, marked with an 'X' and dotted line trail, alongside a rolled-up scroll or telescope.
Illustration of a vintage microscope with a brown and black color scheme on a black background.