Educational: Mathematics, science and technology, general

As the planet's human population explodes, so does the demand for water.

In 2013, the FBI started posting a new most wanted list-not for kidnappers, murderers, or armed robbers, but for online crooks.

Discover the inspiring true story of Isatou Ceesay, an African woman who started a recycling movement to combat the pollution caused by plastic bags in her community.

Have you ever solved a tricky puzzle?

Have you ever built a cool science project?

Do you enjoy snapping photos or taking movies of your adventures?

Have you ever wondered how the universe began?

How did our knowledge of matter, gravity, and electricity develop over time?

How did our knowledge of cells, heredity, evolution, ecosystems, and photosynthesis develop?

Sunlight, air, water, and minerals help keep plants alive.

A plant can form fruit and seeds when it is pollinated.

Sunlight helps a plant make its own food using photosynthesis.

Plants have roots, stems, leaves, and sometimes flowers.

Roots help keep plants alive.

Some flowers are able to produce seeds or fruit without getting pollen from another plant.

The flower is the part of a plant that makes seeds or fruit.

Many insects drink nectar and collect pollen from flowers, and in the process they help plants reproduce.

Some plants need to have pollen spread from one plant to another flower in order to reproduce.

Many plants depend on animals to help move pollen around so that the plants can reproduce.

Plastic: it's used to make everything from drink bottles and bags to toys and toothbrushes.

Did you know that about 40 percent of the world's population lives without toilets?

After the 1986 Chernobyl nuclear explosion in Ukraine, scientists believed radiation had created a vast and barren wasteland in which life could never resurface.

Ice in the Arctic is disappearing-and opportunity is calling.

The octopus spies a nice, tasty mantis shrimp.

What animal was here?

Does the universe circle around Earth?

Do your eyes send out light like headlights?

Do bulls get angry when they see the color red?

Math is everywhere in shopping!

Math is everywhere when you're traveling!

Math is everywhere in the kitchen!

Math is everywhere in sports!

Robots help us understand our universe.

Quick!

Did you know that the same wind that messes up your hair can be used to create energy?

Did you know that the sunlight that warms your skin on a sunny day can be used to produce energy?

Did you know that tiny atoms that make up all matter hold huge amounts of energy?

Did you know people can turn the energy in rushing water into electricity?

Did you know people can dig underground and use Earth's heat to make energy?

Did you know that most of the energy we use comes from coal, oil, and natural gas?

Crackle!

What would you be if your finger bones grew so long that they reached your feet?

A leaf is a leaf, a bit of a tree.

In this humorous look at shapes, Brian P.

In the first book of the Math Is Categorical(R) series, readers will become familiar with the concept of addition and its key terms.

The author and illustrator of the best-selling Words Are CATegorical(R) series brings their trademark sense of humor to the subject of subtraction.

In this wacky look at weight, Brian P.

Brian Cleary and Brian Gable bring their trademark sense of humor to the subject of measuring length.

In this playful look at patterns, Brian P.

The zany CATegorical cats introduce the measurement of time, from seconds, minutes, and hours up to decades.