Jennifer Kroll - Mighty Micros: Little Things, Big Results

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Jennifer Kroll

MICROS

MIGHTY

LITTLE THINGS BIG RESULTS

Consultants

Timothy Rasinski, Ph.D.

Kent State University

Lori Oczkus

Literacy Consultant

Based on writing from

TIME For Kids. TIME For Kids and the TIME

For Kids logo are registered trademarks of

TIME Inc. Used under license.

Publishing Credits

Dona Herweck Rice , Editor-in-Chief

Lee Aucoin , Creative Director

Jamey Acosta , Senior Editor

Heidi Fiedler , Editor

Lexa Hoang , Designer

Stephanie Reid , Photo Editor

Sandy Phan , Contributing Author

Rachelle Cracchiolo , M.S.Ed., Publisher

Image Credits: p.39 Alamy; p.20

Limbikani S.K. Makani ; pp.25 (top), 26, 27

(zooplankton), 27 (top), 29 (bottom), 3637,

51 (top), 5455 Getty Images; p.6 (right) The

Granger Collection; p.6 (right) Lexa Hoang;

p.50 imagebroker/Anton Luhr/Newscom;

p.52 ZUMAPRESS.com/Newscom; pp.2425

NASA; pp.48, 54 (illustrations) Kevin Panter;

pp.3435 (illustrations) Matthew Tiongco;

pp.89, 2021, 4445, 49 (illustrations)

Timothy J. Bradley; pp.13 (left), 2223,

23, 27 (phytoplankton), 31, 3233, 36,

5051, p.56 Photo Researchers Inc.; p.7

(top) Jan Verkolje [Public domain], via

Wikimedia Commons; All other images from

Shutterstock.

Teacher Created Materials

5301 Oceanus Drive

Huntington Beach, CA 92649-1030

http://www.tcmpub.com

ISBN 978-1-4333-4948-5

2013 Teacher Created Materials, Inc.

Synched Read-Along Version by:

Triangle Interactive LLC

PO Box 573

Prior Lake, MN 55372

ISBN-13: 978-1-68444-986-6 (e-book)

Mini but Mighty ...............

The Buzz on Bugs .............

Plankton Power ..............

The World Inside You .........

The Amazing Atom ...........

Tiny Technology ..............

Dream Big ...................

Glossary .....................

Index .......................

Bibliography ................. 62

More to Explore ..............

About the Author .............

Table

of

Contents

Mini

but

Mighty

People are often told to think big . But some

of the most powerful creatures and objects in the

world are tiny . Tweezers are needed to place the

microchips that run in computers . People need a

microscope to see the plankton in the ocean . Yet

these and other puny powerhouses make big things

happen . They can be humans greatest helpers or

their worst enemies .

You cant view a simple

life form such as a

paramecium without

using a microscope .

What is the natural role of tiny

living things on Earth ?

In what ways can tiny creatures

wreak major damage ?

How do very small machines and

technology make our lives better ?

The average

microchip is about the

size of a grain of rice .

A computer central

processing unit ( CPU ) can

be smaller than a dime .

Little things can cause both bad and good results .

Bugs and bacteria can spread deadly diseases .

Scientists work with atoms and tiny technology to

make powerful weapons . But small living things are

an important part of the life cycle . They can help

plants , animals , and humans stay healthy .

People have wanted to take

a closer look at tiny things for

many years . Around 1590 ,

Dutch eyeglass makers

created the first light

microscope . They placed

two glass lenses in a tube .

Objects looked larger

through the tube . People

have been studying

smaller and smaller

objects ever since .

A Closer Look

Some of the first

microscopes were

made with glass ,

wood , cardboard ,

and fish scales .

early microscopes

Amazing

Animalcules

Anton van Leeuwenhoek was a cloth

salesman . In the 1660s , he ground glass

lenses to magnify cloth fibers . He soon

used his microscopes to study other small

things such as blood cells and insects .

Van Leeuwenhoek was the first

person to see bacteria in pond

water . He called them

animalcules .

Sweating the Small Stuff

The tiniest lines on most rulers are millimeters ( mm ). They

are very useful for measuring little things like a flea or the

microchip a vet puts under your pets skin . But what about

stuff so small it cant be seen with the human eye ? Scientists

use a unit of measure called a micrometer ( m ) to measure

tiny creatures such as plankton and bacteria . A micrometer

is one thousandth of a millimeter . A light microscope reveals

these objects . A nanometer ( nm ) is smaller still . Its one

millionth of a millimeter . An electron microscope is needed

to see these objects.

microchip

mm

visibility

human

eye

light

microscope

electron

microscope

copepod

mm

flea

3.5 mm

diatom

m

Which of these objects have you seen ?

Which is bigger , a nano robot or a

human cell ?

Could you use a light microscope to

see a plant cell that is m in size ?

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