Brain Quest — Science Riddles & Puzzles

Science Mystery

The Invisible Shield

I am invisible, yet I protect all life on Earth. Without me, the Sun would burn everything alive. Scientists discovered a hole in me in 1985. What am I?

5 XP 42 tried · 39 solved

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Science Mystery

The prison

I trap light so it can never escape, I am born when a giant star dies. What am I?

5 XP 4 tried · 1 solved

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Science Mystery

The winter flower

I bloom in the sky in winter, I fall like flowers but I am made of frozen water. No two of me are same. What am I?

5 XP 2 tried · 2 solved

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Science Mystery

The Universe's Speed Limit

I race faster than anything known. I have no weight, but I carry energy across the universe. What am I?

5 XP 15 tried · 11 solved

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Science Mystery

The Hidden Bond

I am invisible, yet I hold atoms together. Break me, and energy may be released or absorbed. Without me, no molecules could exist. What am I?

5 XP 18 tried · 16 solved

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Science Mystery

The Endless Push

I have no engine, no wings, and no fuel. Yet once I begin moving through empty space, I can keep moving for millions of kilometers. What law explains this?

5 XP 16 tried · 7 solved

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Science Mystery

The Silent Guardian.

I protect every living cell, Yet I am thinner than a strand of hair. I decide what enters and what leaves, Without me, life cannot survive.

5 XP 16 tried · 16 solved

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Science Mystery

The Tireless Pump

I never sleep, I never take a holiday, I work from before you're born Until your final breath. Who am I?

5 XP 16 tried · 16 solved

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Science Mystery

The Silent Current

I travel through wires, Yet you can never see me. I light your room, Charge your phone, And power entire cities. What am I?

5 XP 17 tried · 15 solved

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Science Mystery

The Tiny Universe

I am made of tiny particles. But I am not alive. I have a center with things going around it, Like a miniature solar system.

5 XP 19 tried · 11 solved

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Science Mystery

The Invisible Builder

I am too small to see with your eyes. Some of us make yogurt, Some help your stomach, Some can make you sick. Without us, life on Earth would struggle. Who are we?

5 XP 16 tried · 16 solved

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Science Mystery

The Green Factory

I am a quiet factory that runs completely without electricity. I take in sunlight, water, and invisible gas, and I turn them into food for myself and fresh air for you. What process am I?

5 XP 16 tried · 16 solved

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Science Mystery

The Universal Mixer

I have no colour, No smell, No taste. Scientists call me the universal one, Because I dissolve more substances than anything else. What am I?

5 XP 15 tried · 15 solved

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Science Mystery

The sun chef

I eat sunlight, I drink water, I never go to the kitchen but I make food for the whole world. Who am I?

5 XP 18 tried · 14 solved

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Science Mystery

The invisible power

I have no weight, you can't see me, but without me you can't live for even 5 minutes. I am taken in by your lungs. What am I?

5 XP 17 tried · 16 solved

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Science Mystery

The red river

I am red, I flow but not a river, I have no fish but I carry life to every part of your body. What am I?

5 XP 18 tried · 18 solved

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Science Mystery

The long journey inside you

I start with a bite but I have no mouth, I travel 30 feet without legs, I have acid but I am not angry, and I give you energy without eating myself. What am I?

5 XP 15 tried · 12 solved

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Science Mystery

The Invisible Sculptor

I have no hands, yet I carve valleys. I have no eyes, yet I reshape mountains. Sometimes I whisper for centuries, Sometimes I roar in a single day.

5 XP 17 tried · 13 solved

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Science Mystery

Chemical helper

I hide in stone with a frosty name, Though I'm no ice, I earned my fame. I helped make shining metal flow, In fiery baths where furnaces glow. A fluoride rare, once prized by all.

5 XP 16 tried · 14 solved

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Science Mystery

The World's Greatest Recyclers

We are everywhere, Yet most people never notice us. Without us, Dead plants and animals would pile up forever. Who are we?

5 XP 15 tried · 15 solved

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Science Mystery

The Invisible Giant

I have no colour. I have no shape. You cannot see me, Yet I keep your feet on Earth, The Moon around Earth, And planets around the Sun.

5 XP 17 tried · 17 solved

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Science Mystery

The Silent Rust Maker

You breathe me every second. Without me, you would die. Yet when I slowly meet iron, I quietly destroy it. Who am I?

5 XP 17 tried · 17 solved

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Science Mystery

The Endless Fall

I am always falling towards Earth, but I never hit the ground. I pull on the oceans, but I have no hands. I have no fire of my own, but I shine brightly in the dark. What am I?

5 XP 16 tried · 14 solved

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Science Mystery

The Water Thief

I am a very strong . I can take water out of sugar. Factories use me a lot to make fertilizer. Who am I?

5 XP 19 tried · 16 solved

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Science Mystery

the disaster

I have no voice, but I make the world shake. I’m made by the shifting of plates. I'm measured by a Richter scale, but I'm not a weight. I can topple towers and alter the earth's fate.What am I?

5 XP 21 tried · 21 solved

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Science Mystery

The Ultimate Brain Teaser

I slow near giants, I race in the void, I cannot be touched, Yet I change everything. Without me, the universe has no story. What am I?

5 XP 19 tried · 19 solved

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Science Mystery

Nature's Hidden Code

I am not a book, yet I hold life's instructions. I am not alive, yet I am copied billions of times. I am found in almost every cell, And though invisible, I shape every living thing. What am I?

5 XP 29 tried · 29 solved

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Science Mystery

Think Like Einstein.

The faster you move, the slower I become for you. You cannot see me, but Einstein proved I can bend. What am I?

5 XP 24 tried · 20 solved

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Science Mystery

The First Responder

I race through your body faster than your feet ever could. You have never seen me, but you've felt me every time you touched a hot stove. I carry no words, yet I deliver every message. What am I?

5 XP 26 tried · 22 solved

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