ESO 2. Science

2. Energy

Why sustainable power is unsustainable.

Serious obstacles on the road towards a future of renewable sources of energy.

The 10 big energy myths.

There has never been a more important time to invest in green technologies, yet many of us believe these efforts are doomed to fail. This article disagrees.

Power plants of the world.

Google Earth file showing a list with most of the world's power plants classified by type.

Dirty energy threat to green Brazil.

Brazil boasts of being one of the world's "greenest" energy suppliers, but recent policy initiatives could jeopardise its desire to be a big player in future climate change discussions.

The big thirst.

Article in The New York Times pondering the worrying future of our most wanted fuel: oil.

How oil refining works.

Great review on one of the most important industrial processes in our society. With images and videos.

Can carbon fiber solve the oil crisis?

Cutting a car's weight makes a lot of sense in the knowledge that we are running down of oil. Learn how carbon fiber could help.

How does solar power work?

Very interesting and easy to understand introduction to solar power and its current state of development.

The solar power towers of Seville.

Learn how solar power is being produced in the hot countryside near Seville.

Is the Sun setting on solar power in Spain?

An article of the current heyday of solar power in Spain and its dependency on subsidies.


Encyclopaedia Britannica online article on biofuels.

Gas 2.0.

Hot news on biofuels.

Are biofuels bad?

A scientific study says that biofuels are even worse than the gasoline for the current climatic change. Learn why.

How biodiesel works.

To learn it all about one of the most important alternatives to fossil fuels.

Can I make my own ethanol?

Ethanol, mixed with a small amount of gasoline, can be used to fuel cars. Learn how to make it at home, safely and cheaply.

Can I run my MP3 player on methanol?

They even say that you can run it with an onion and Gatorade, so why not with methanol?

Forget solar panels, this house runs on algae.

Students at the University of Cambridge have designed an energy and carbon-neutral house powered entirely by algae.

New facility uses algae to turn coal pollution into fuel.

A coal fired power-plant in Oregon has started a pilot project to stop pollution by using algae to collect carbon dioxide and make fuel and other useful products.

5 myths about wind energy.

Wind energy might be the simplest renewable energy to understand. Yet there are misconceptions about what makes it turn.

Windfarms unlikely to threaten birds.

Conservation groups have raised fears that large birds could get caught in the turbines and that these structures could disturb other species. But this idea is slowly fading away. Learn why.

Biomass energy 'could be harmful'.

Biomass power - such as burning wood for energy - could do more harm than good in the battle to reduce greenhouse gases.

How geothermal energy works.

Introduction to what geothermal energy is and how we can make use of it.

One hot island.

Learn about Iceland's renewable geothermal power.

US geothermal energy.

Enhanced Geothermal Systems is an initiative meant to harness all the power of the subsurface heat to produce electricity and heat. This Google Earth file shows all the potential of this kind of energy in the United States. There is a video describing the project at YouTube.

How hydrogen cars work.

The car of the future is here today. It doesn't use gasoline and it doesn't pollute the air. In fact, it produces steam instead of exhaust. And the mystery fuel? Hydrogen, the simplest and most abundant element in the Universe.

3. Heat and Temperature

Temperature at The Open Door web site.

Learn everything about measuring temperature: thermometric scales, types of thermometers, interesting temperatures and more.

6. Chemical Changes

The golden book of chemistry experiments.

Probably many of them are not the ones you should try at home without the supervision of an adult; still, it is an amazing resource with a wealth of information if you dream to become a professional chemist some day.

Periodic Table of the Elements.

In many different languages and with links to the Wikipedia articles on each one of the chemical elements.

Chemical reactions in

A very comprehensive and easy to understand resource meant for pupils in secondary education. Use the links in the top right menu to further along the tutorial.

What happens when you carbonate water?

Learn what an acid is through an experiment with carbonated water and red cabbage.

The amazing rusting aluminum.

Rusting of aluminium can either hold an airplane together or dissolve it to bits. Learn how.

8. Nutrition in Living Beings

Photosynthesis on land and on water.

Very simple animation showing how photosynthesis takes place both in land and in water living things.

9. Interaction and Coordination in Living Beings

How animal migration works.

Learn about the biggest, longest and most amazing animal migrations in the world, and figure out why and how animals make such astonishing journeys.

World on the move.

A wonderful map-based website to learn about animal migrations, from the geese to the whales.

10. Reproduction in Living Beings

Flower structure.

Learn the parts of an angiosperm flower and the functions of each.

General stages in the life cycle of flowering plants.

Very useful commented photo gallery to learn about the life cycle of angiosperms.


The foxglove is a marvellous example of a plant which is adapted to be pollinated by insects. Learn how certain parts of this plant have been specially modified over time so that it is able to attract insects.

Orchids: nature's sexy sirens.

Orchids are just fascinating beings. Their refined sexual behaviour involves from promising food to even tricking insects into thinking they're a sexual partner. Learn more.

Male wasps make love to orchids.

Learn how orchids mimic female wasps to favour their own fertilisation.

Penis length isn't everything… for barnacle males.

Longer isn't always better, according to some men, and it seems the same is true for barnacles, too.

'Virgin births' for giant lizards.

Females of the Komodo Dragon, the largest lizard in the world, are capable of producing offspring without male contact.

Ants inhabit 'world without sex'.

An Amazonian ant has developed into an all-female species, researchers have found.

11. The Ecosphere and the Ecosystems

Analyzing an ecosystem.

Excellent quizz to test your knowledge on the basics of ecosystems.

Jack and the beanstalk.

Cartoon film that uses the traditional pantomime story of "Jack and The Beanstalk" to link different types of feeding relationship. Includes reference to autotrophs, herbivores, carnivores, parasites, symbionts and saprotrophs.

Marine food web.

Interactive activity to place different marine species in their correct trophic levels.

World biomes interactive map.

Another great interactive map to see the occurence and learn the main characteristics of the world's biomes. With many activities.

Water ecosystems.

A brief introduction to fresh-water and marine ecosystems.

How wetlands work.

Water lilies, turtles, frogs, ducks, snakes, dragonflies, minnows, herons, sticky black muck, monsters… What do these things have in common? Wetlands.

National marine sanctuaries.

Collection of select videoclips and still images from USA's underwater treasures.

How the Galapagos islands work.

One of the world's most famous ecosystems is the place that inspired Charles Darwin's theory of evolution. But there's more to it than just finches and tortoises.

Scenes from Antarctica.

A great set of 32 stunning photos taken in the Antarctica.

10 of today's most important environmental issues.

A list that neatly summarizes some of our most pressing environmental concerns.

Disappearing forests of the world.

Google Earth file showing deforestation data for different countries.

Interactives: Garbage.

Good lesson with coverage of topics such as solid waste, hazardous waste, sewage and waste reduction efforts.

What's the biggest threat to freshwater habitats?

Learn what ar the freshwater habitats, why are they important, and how agriculture endangers them.

Why could China's Three Gorges Dam cause an environmental disaster?

Is it a milestone of modern engineering or a potential environmental disaster?

Ocean debris turning Hawaiian beach into plastic.

Consumer waste from the "Great Pacific Garbage Patch" is turning a Hawaiian beach "into plastic".

Protected areas of the world.

Google Earth file showing the protected area network for a number of countries.

Biodiversity hotspots.

Google Earth file showing information about the Earth's 34 Biodiversity Hotspots, as defined by Conservation International. These are the most important areas for conservation, with very large numbers of endemic species. Each of the hotspots has lost more than 70% of its original forest.

Protected Planet.

Protected Planet lets you view the world's protected areas on a Google Map. If you click on one of the mapped protected areas then you are taken to a close-up of the selected area, which includes photographs, points of interest in the area and links to related protected areas.

WWF - Have fun while making a point.

Are you looking for games to find out more about key conservation issues such as endangered species, global warming and pollution? If you are, then go right ahead and indulge yourself!

Recycle City.

See how the people of Dumptown turned their town around, reducing waste and saving money or play the Dumptown game and create your own scavenger hunt.

How composting works.

Composting is a method that transforms solid organic waste into a product that can benefit the environment as a natural fertilizer for gardening and farming. Learn more.

50 ways to help the planet.

50 actions that people can carry on in their daily lives to help preserve the Ecosphere.

Top 5 green myths.

Many of us have adopted small, easy habits to help make our lives a little more environmentally friendly. But how can you be sure your choices are right for the planet?

Top 10 myths about sustainability.

In-depth article explaning the real meaning of such a popular word.

How do you clean up an oil spill?

Despite stricter penalties and better ship design, oil spills haven't been eliminated. And when they happen, what can be done to clean up that mess?

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