Science and math videos that show kids why
See Why answers the questions kids actually ask, like why ice floats or why you flip the fraction, with short animations that make the invisible visible. Each video runs three to four minutes, is made for ages 9–13 (grades 4–8), and is fact-checked before it's animated.
Episodes
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Chemistry/Earth ScienceGrades 4–83:40 minFree lesson packWhy Is the Ocean Salty?
Rivers carry salt into the ocean, and only the water leaves.
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MathGrades 5–73:45 minFree lesson packWhy Do You Multiply Fractions Straight Across?
The bottoms count all the pieces, and the tops count the pieces you keep.
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PhysicsGrades 4–83:38 minFree lesson packWhy Is the Sky Blue?
The sky is blue because air scatters blue sunlight all across the sky.
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MathGrades 6–84:08 minFree lesson packWhy Does a Negative Times a Negative Equal a Positive?
A negative flips you to the opposite side, so two negatives flip you back.
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BiologyGrades 4–83:21 minFree lesson packWhy Do Leaves Change Color in the Fall?
Leaves change color because the green fades away, and the other colors finally get their turn.
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MathGrades 5–73:27 minFree lesson packWhy Do You Flip the Fraction When Dividing?
We flip because the bottom number cuts, and the top number groups.
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ChemistryGrades 4–83:22 minFree lesson packWhy Does Ice Float?
Ice floats because freezing spreads its molecules apart.
New episodes every Wednesday and Sunday on YouTube.
How a See Why video works
- The question. One real kid question per video, asked in the first ten seconds.
- The puzzle. What would you expect? We set up the wrong guess so the answer lands.
- Zoom in. The animation shrinks down to molecules, cells, or blocks and pieces so you see the reason, not just a rule.
- The aha. One moment where it clicks, then a one-line recap kids can repeat.
For teachers and parents
- Free printable lesson packs: worksheet, discussion questions, quiz, and answer key.
- Linked to NGSS and Common Core where they fit.
- Every script is checked against reliable sources, listed on each episode page.
- Simplified, never wrong: anything we simplify is noted for teachers.
- Videos are set to "Made for Kids" on YouTube. This site has no ads, sign-ups, or tracking.
Subjects
Biology · Chemistry · Chemistry/Earth Science · Math · Physics · more to come: physics and biology questions are next in line.