Otona No Kagaku, or ‘Science for Adults’ is a ‘mook’ series published by Gakken in Japan. Each issue has includes a kit that goes along with whatever the issues topic is. I could hardly wait for this one! It’s a crystal radio. Very classy design too, that diamond weave coil design is a real eye catcher. It includes a diode that you can use as a detector or if your feeling like playing with the cat’s whisker a bit you can use the tow mineral samples. The reception isn’t as good as with the diode but you get the true crystal experience with this method. In the base of the radio is a small battery operated amplifier so you can use the radio without a super long antenna. I don’t think it’s cheating, your still using a chunk of rock to rectify the signal. It took me about two hours to put everything together and that’s with a few false starts in winding the coil. As my Japanese is very bad, I did have to look up the characters for some basic colors so I could connect the wires in the right order. This page on about.com proved to be quite useful with this. Now, the selectivity isn’t the best but that can be fixed with a little tinkering under the hood. It does receive the local stations quite nicely and best of all it just looks dead on cool. I took loads of photos of the build to have a gander at them and enjoy.