Otona No Kagaku, or ‘Science for Adults’ is a ‘mook‘ (‘M’agazine + b’OOK’) series published by Gakken in Japan. Each issue has includes a kit that goes along with whatever the issues topic is. This one deals with heat engines and comes with a low temperature Stirling engine. The entire project took me about an hour to put together and it quite satisfying once you see it chugging away over a cup of hot water. This kit was bought from Karakuricorner, they have loads of the mooks there. If you know of anyone that likes science and can use a screw driver I would seriously think of buying one of these at a gift. And it’s not like the projects are lame either, you can make a pinhole camera, radio receivers from crystal to vacuum tube, microscopes, telescopes, and even a planetarium. I can only hope that one day I’ll be able to go into a book store of hobby shop here in the US and find kits of this quality and diversity. There may be some hope in this as I did notice that the pages of the mook are numbered from left to right. This would make translating the layout into English a lot simpler.