• Welcome
    • The digitizing project
    • What was Childcraft?
      • Organization of Childcraft
      • Getting to know Childcraft
      • Introducing Childcraft in the home
    • Reading to your Child
  • The Books
    • 1 – Once Upon a Time
      • Nursery Rhymes
      • Stories & Poems
      • Folk & Fairy Tales
      • Favorite Fables
      • Things to Know
    • 2 – Time to Read
    • 3 – Stories and Poems
      • Stories
      • Poems
    • 4 – World and Space
      • Our Home, the Earth
      • Oceans, Lakes, and Rivers
      • Air, Wind, Clouds, and Weather
      • Mountains, Valleys, and Plains
      • Planets, Stars, and Galaxies
      • Rocks, Stones, and Petrified Bones
    • 5 – About Animals
      • The Animal Kingdom
      • It’s a Mammal
      • It’s a Bird
      • It’s a Fish
      • It’s a Reptile
      • It’s an Amphibian
      • Many-Legged Creatures
      • Animal Ways
      • The Animals’ World
      • The World of the Sea
      • Staying Alive
      • Living Together
      • Animals of Long Ago
      • Vanishing Animals
      • Domestic Animals
      • People and Animals
    • 6 – The Green Kingdom
      • Seasons of Life
      • Plant Ways
      • Nature’s Neighbors
      • Strange and Surprising Plants
      • How Does Your Garden Grow?
      • Famous Gardens
      • Meet the Trees
      • Plants of Long Ago
      • People and Plants
      • Saving the Plants
      • True Tales and Tall Tales
      • Look for a Lovely Thing
    • 7 – Story of the Sea
      • Animals of the sea
      • Water world
      • Fish
      • Birds
      • Coelenterates
      • Crustaceans
      • Echinoderms
      • Mammals
      • Reptiles
      • Mollusks
      • Sponges, sea squirts, and worms
      • Strange stories of the sea
      • Might and majesty of the sea
      • People and the sea
      • People who work on the sea
    • 8 – About Us
      • Brothers and Sisters, Moms and Dads
      • Fingers and Forks
      • How Do You Know?
      • Let’s Go to My House
      • Living in Two Worlds
    • 9 – Holidays and Birthdays
      • Holiday Time
      • January
      • February
      • March
      • April
      • May
      • June
      • July
      • August
      • September
      • October
      • November
      • December
    • 10 – Places to Know
      • Oh! And ah! Places
      • Queer, Quaint, And Curious Places
      • Seven Wonders Of The Ancient World
      • Treasure Places
      • What’s In A Name?
      • All That’s Left
      • As Good As Old
      • Just For Fun
      • Where Animals Are Famous
      • Where Battles Were Fought
      • Where Land And Water Meet
      • Where Nature Gets In The Way
      • Where People Worship
      • Where They Run A Country
    • 11 – Make and Do
      • Nature Crafts
      • Paint and Print
      • Papier-Mache
      • Puppets and Plays
      • Sew and Stitch
      • Gifts to Give
      • Hook, Weave, Knot, and Braid
      • Let’s Dress Up
      • Let’s Play Games
      • Let’s Play with Clay
    • 12 – How Things Work
      • What’s the Matter?
      • Currents and Sparks
      • Full of Energy
      • Hear All About It
      • Hot and Cold
      • Let’s Get Moving
      • Machines Make It Easy
      • More Things That Work
      • Seeing the Light
    • 13 – Mathemagic
      • How long, how fast, how hot, how heavy?
      • People who work with numbers and shapes
      • Points, lines, shapes, and designs
      • Puzzle fun!
      • What are your chances?
      • What can you do with numbers?
    • 14 – About Me
      • Becoming Me
      • I Speak, I Listen
      • I Wonder, I Think
      • Inside and Outside of Me
      • The Many Me’s
      • There’s Nobody Exactly Like Me
      • Watch Me Grow
      • What Does Me Mean to Me?
      • What I Can Do
    • 15 – Guide to Childcraft
      • The New Baby: Birth to 18 months
      • The Toddler: 18 months to 3 years
      • The Preschooler: 3 to 5 years
      • The School-Age Child: 5 to 8 years
      • The Preteen: 8 to 13 years
      • Health and safety
      • For Special Consideration
      • Medical Guide
  • Random Post
  • Contact
  • Welcome
    • The digitizing project
    • What was Childcraft?
      • Organization of Childcraft
      • Getting to know Childcraft
      • Introducing Childcraft in the home
    • Reading to your Child
  • The Books
    • 1 – Once Upon a Time
      • Nursery Rhymes
      • Stories & Poems
      • Folk & Fairy Tales
      • Favorite Fables
      • Things to Know
    • 2 – Time to Read
    • 3 – Stories and Poems
      • Stories
      • Poems
    • 4 – World and Space
      • Our Home, the Earth
      • Oceans, Lakes, and Rivers
      • Air, Wind, Clouds, and Weather
      • Mountains, Valleys, and Plains
      • Planets, Stars, and Galaxies
      • Rocks, Stones, and Petrified Bones
    • 5 – About Animals
      • The Animal Kingdom
      • It’s a Mammal
      • It’s a Bird
      • It’s a Fish
      • It’s a Reptile
      • It’s an Amphibian
      • Many-Legged Creatures
      • Animal Ways
      • The Animals’ World
      • The World of the Sea
      • Staying Alive
      • Living Together
      • Animals of Long Ago
      • Vanishing Animals
      • Domestic Animals
      • People and Animals
    • 6 – The Green Kingdom
      • Seasons of Life
      • Plant Ways
      • Nature’s Neighbors
      • Strange and Surprising Plants
      • How Does Your Garden Grow?
      • Famous Gardens
      • Meet the Trees
      • Plants of Long Ago
      • People and Plants
      • Saving the Plants
      • True Tales and Tall Tales
      • Look for a Lovely Thing
    • 7 – Story of the Sea
      • Animals of the sea
      • Water world
      • Fish
      • Birds
      • Coelenterates
      • Crustaceans
      • Echinoderms
      • Mammals
      • Reptiles
      • Mollusks
      • Sponges, sea squirts, and worms
      • Strange stories of the sea
      • Might and majesty of the sea
      • People and the sea
      • People who work on the sea
    • 8 – About Us
      • Brothers and Sisters, Moms and Dads
      • Fingers and Forks
      • How Do You Know?
      • Let’s Go to My House
      • Living in Two Worlds
    • 9 – Holidays and Birthdays
      • Holiday Time
      • January
      • February
      • March
      • April
      • May
      • June
      • July
      • August
      • September
      • October
      • November
      • December
    • 10 – Places to Know
      • Oh! And ah! Places
      • Queer, Quaint, And Curious Places
      • Seven Wonders Of The Ancient World
      • Treasure Places
      • What’s In A Name?
      • All That’s Left
      • As Good As Old
      • Just For Fun
      • Where Animals Are Famous
      • Where Battles Were Fought
      • Where Land And Water Meet
      • Where Nature Gets In The Way
      • Where People Worship
      • Where They Run A Country
    • 11 – Make and Do
      • Nature Crafts
      • Paint and Print
      • Papier-Mache
      • Puppets and Plays
      • Sew and Stitch
      • Gifts to Give
      • Hook, Weave, Knot, and Braid
      • Let’s Dress Up
      • Let’s Play Games
      • Let’s Play with Clay
    • 12 – How Things Work
      • What’s the Matter?
      • Currents and Sparks
      • Full of Energy
      • Hear All About It
      • Hot and Cold
      • Let’s Get Moving
      • Machines Make It Easy
      • More Things That Work
      • Seeing the Light
    • 13 – Mathemagic
      • How long, how fast, how hot, how heavy?
      • People who work with numbers and shapes
      • Points, lines, shapes, and designs
      • Puzzle fun!
      • What are your chances?
      • What can you do with numbers?
    • 14 – About Me
      • Becoming Me
      • I Speak, I Listen
      • I Wonder, I Think
      • Inside and Outside of Me
      • The Many Me’s
      • There’s Nobody Exactly Like Me
      • Watch Me Grow
      • What Does Me Mean to Me?
      • What I Can Do
    • 15 – Guide to Childcraft
      • The New Baby: Birth to 18 months
      • The Toddler: 18 months to 3 years
      • The Preschooler: 3 to 5 years
      • The School-Age Child: 5 to 8 years
      • The Preteen: 8 to 13 years
      • Health and safety
      • For Special Consideration
      • Medical Guide
  • Random Post
  • Contact
How long, how fast, how hot, how heavy?, Mathemagic

Measuring mountains

> Have you ever wondered how people measure the height of a mountain? > They don't do it by climbing the mountain and measuring with a ruler > as they go! The height of a mountain is found by...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Measuring temperature

For thousands of years, people judged the temperature by how they felt. To check the heat of an oven, cooks put a hand into the oven. If the weather felt cold, people put on more clothes. Long, long...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Measuring speed

The mighty Superman can move faster than a speeding bullet---but how fast is that? A tiny snail creeps along at what is called a "snail's pace"---but how slow is that? There's an easy way to measure...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Minutes, seconds, and nanoseconds

> Atop a tower in the town square hung a big bell. At each side of the > bell was a large iron statue of a man. Each statue held a hammer in > its hands. > > Suddenly, one of the statues seemed to...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Water clocks and sand clocks

Measuring time by the sun or the stars is all very well, but people soon needed a better way. And this need led to the invention of the water clock. The first water clock was just a large clay or...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Sun clocks

A clock certainly seems nothing like a ruler. Yet, a clock and a ruler do the same kind of job. They both measure something. A ruler measures length and a clock measures time. People of long ago...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Twenty-four hours a day

Why do we have twenty-four hours in a day? Why not twenty hours? Or sixteen hours? As a matter of fact, we have twenty-four hours in a day simply because the Egyptians did. They invented the...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

The birth of the calendar

A year is a long time. So, long ago, people decided to divide it into shorter time periods. About five thousand years ago, the Sumerians divided the year into twelve "moons." Each moon had thirty...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Measuring time by the stars

People of long ago lived out of doors most of the time, so they were used to seeing the stars at night. And they knew that the stars moved across the sky during the year. Because the stars always...

Manuel
March 3, 2024March 3, 2024
How long, how fast, how hot, how heavy?, Mathemagic

Suns and moons, winters and summers

If you want to know what time it is, you look at a watch or a clock. If you want to know the date, you look at a calendar. A clock measures time during a day. It lets you know when to turn on a...

Manuel
March 3, 2024March 3, 2024
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