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What if there is a power failure and you have to charge your cell phone? With these instructions you can build your own charger that works with a bicycle dynamo.
What is soap? And how does it work? Soap removes bacteria from your hands, which is important for your health and gives a clean feeling. Find out more and follow
By making a UV-meter you can test how well your (homemade) sunscreen blocks ultraviolet (UV) radiation from the sun. Ultraviolet waves are invisible, but are always around us. How can you make
If you stay in the sun for too long, your skin will burn. This is not caused by the heat, but by the ultraviolet (UV) radiation from the sun. A sunburn is painful, but
What is the recipe for fertile soil or good compost? A little acid, a little limestone, a little...? Make an experimental garden and learn more about the life of plants: Download the
We can’t see them, but do inhale them every day: particulate matter, one of the most harmful forms of air pollution. But what are they? Particulates are small particles floating
Are bacteria good, bad, or both? How clean are your hands? Discover how well your (homemade) soap works by testing how many bacteria are still on your hands after washing.
Making your own yogurt is easy, healthy and tastes great. Discover how to transform ordinary milk into yogurt with the help of some friendly bacteria. Download and print the instructable
How acidic is the water? And how about the soil? Examine the acidity of the soil, your (home made) yogurt, soda or the water in your area using something as