Population

* How many people live on Earth? You can check the World Population Clock here and compare it with different years.

* Check out the most populated countries in the world HERE.

* Check out the most populated cities in the world HERE

Make electronic music

Have fun playing with this synthesizer. You will make wonderful electronic music in a minute!
TONEMATRIX

A real animal that looks like Pikachu

Very similar! They painted it yellow, though.

Machines

There are different types of SIMPLE MACHINES. Click on the names to learn about some of them. You can also watch a video about them here.

LEVERS
PULLEY
WHEEL
INCLINED PLANE

Play the COMPOUND MACHINE game here. .

Build your own robot here.

Print this word search.

Wikipedia

You can learn about anything on this free Encyclopedia.
You can check the ENGLISH VERSION or the SPANISH VERSION.

Water

How much water is there on Earth? A lot! Check it out here.
Help the people in this village pumping water in this game.

The Water Cycle.
* Watch an animation to learn about it.
* Watch a picture of it.
* Download and watch a presentation about a water drop.
* Print and play this word search.
* Build your own water cycle.
* Print and play this book of activities related to water.