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Editor’s pick · Ages 9-12
Why Does Time Slow Down When You Move Very Fast?
Einstein's relativity shows that time is not the same for everyone, and clocks moving near light speed tick measurably slower than clocks at rest.
Read 4 min →Matching stories
50 stories
Ages 9-12
Why Can a Tiny Virus Shut Down a Whole Body?
9 pages · 3 min · ♫
Ages 9-12
Why Do We Forget a Dream That Felt So Real?
10 pages · 4 min · ♫
Ages 9-12
Why Is the Ocean Salty When Rain Is Fresh?
10 pages · 4 min · ♫
Ages 9-12
Why Do Some Stars Explode Instead of Fading Away?
11 pages · 4 min · ♫
Ages 9-12
Why Can a Bridge Hold Cars but Collapse in the Wind?
9 pages · 3 min · ♫
Ages 9-12
Why Does a Cut Heal but a Lost Tooth Does Not Grow Back?
8 pages · 3 min · ♫
Ages 9-12
Why Can a Plastic Bottle Outlive the Person Who Used It?
9 pages · 3 min · ♫
Ages 9-12
Why Do We See Lightning Before We Hear Thunder?
10 pages · 4 min · ♫
Ages 9-12
Why Does Your Voice Sound Strange in a Recording?
8 pages · 3 min · ♫
Ages 9-12
Why Do Planes Leave White Trails That Sometimes Vanish Quickly?
8 pages · 3 min · ♫
Ages 9-12
Why Can Two People Taste the Same Food Differently?
10 pages · 4 min · ♫
Ages 9-12
Why Does the Moon Pull Oceans More Than Lakes?
8 pages · 3 min · ♫
Ages 9-12
Why Do Leaves Change Color Before They Fall?
10 pages · 4 min · ♫
Ages 9-12
Why Can a Desert Be Freezing at Night?
8 pages · 3 min · ♫
Ages 9-12
Why Does Bread Rise Like It Is Breathing?
8 pages · 3 min · ♫
Ages 9-12
Why Do We Get Dizzy After Spinning?
8 pages · 3 min · ♫
Ages 9-12
Why Do Batteries Die Even When Nothing Looks Broken?
9 pages · 3 min · ♫
Ages 9-12
Why Can a Shadow Be Sharp at Noon and Blurry at Sunset?
8 pages · 3 min · ♫
Ages 9-12
Why Does a Magnet Pull a Nail but Ignore a Spoon?
8 pages · 3 min · ♫
Ages 9-12
Why Does Your Skin Wrinkle in the Bath?
9 pages · 3 min · ♫
Ages 9-12
Why Can a Volcano Sleep for Centuries and Wake in Days?
10 pages · 4 min · ♫
Ages 9-12
Why Do We Laugh When Nothing Is Actually Funny?
8 pages · 3 min · ♫
Ages 9-12
Why Do Some Animals Glow in the Dark?
12 pages · 4 min · ♫
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