1.30 Parts of a Microscope

1.30 Parts of a Microscope Learn about the parts of a microscope to see how they help us see small things. Explore the ocular lens, light control dial, slide, and the dial to raise or lower the slide, bringing it…

Hoffman Academy

Unit 1 Lessons 1–20 Repertoire Hot Cross Buns D Journey C Boogie Five Woodpeckers Frog in the Middle Chocolate Listen for Bells Skills Piano posture C & D major pentascales Transposing Rhythmic dictation Composing rhythms Improvisation basics Adding chords while…

1.35 Light and Dark

If you have ever wondered about the fascinating science of light, then keep reading! In this lesson, you will learn where light comes from, how it travels in waves, and what makes darkness. Without light, you wouldn't be able to read this right now!

10.6 Inverting a Matrix

10.6 Inverting a Matrix We have seen that we can solve the system of equations described by $$\begin{pmatrix} 3&-4 \ 2&-1\end{pmatrix}\begin{pmatrix} x \ y\end{pmatrix} = \begin{pmatrix} 5 \ -10\end{pmatrix}$$ with Cramer’s rule. Rather than grinding through(打破砂锅问到底) Cramer’s rule, it sure…

4.11 Ancient Greek Soldiers

4.11 Ancient Greek Soldiers They were some of the fiercest and most highly trained warriors on the ancient battlefield. Delve into the lives of Greek soldiers and discover their ways of life for yourself! Ancient Greek Mighty Men Just imagine…

11.32 The Nitrogen Cycle Lesson

The nitrogen cycle is essential for the survival of living organisms on our planet. Most nitrogen is contained in the Earth's atmosphere, and living organisms need a way to access that nitrogen. We will follow the cycle to understand how this happens.

11.31 What is the Greenhouse Effect

How can plants be grown during cold seasons? Inside a greenhouse it stays nice and warm even if there are snowmen outside. Learn how Earth is like a giant greenhouse in this lesson.

4.17 Sparta Government

Sparta was not a democracy, but there are some similarities between the Spartan government and modern democracies. In this lesson, we will learn about the government of Sparta, how it was divided and who was in charge of governing the city.

4.16 Ancient Greek Schools

4.16 Ancient Greek Schools Lesson for Kids Did you know Ancient Greek kids went to school like you do? In this lesson you will learn about the Ancient Greek schools, the students who attended them, and what was learned during…

4.10 Ancient Greece Timeline of Major Events

The history of ancient Greece spans hundreds of years and ranges from Europe to India. Learn about the development of Greek civilization and the challenges it faced in this lesson.

11.30 What is Global Warming

Learn about global warming, what this term means, and how it manifests in the environment. Discover how the Earth stays warm and what causes global warming. Finally, explore how global warming affects different plants and animals.

11.29 What is Energy Conservation

Learn about energy conservation, what it means, and why conserving energy is a good practice. Discover how energy is used in the United States and how individuals can conserve energy in their daily lives.

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