(Français) Order your diffraction grating slide and go to the hunt of UFO's spectrums. Several methods are available to get yours at low cost. The diffraction grating remains as free.
Fifty diffraction gratings are about to be delivered to Ukraine. A warm thank to the private groups from Eastern Europe who realized the importance of these free, easy to use small devices.
Jean-Pierre Petit was invited to the french radio show "Bob vous dit toute la vérité (Bob told all the truth)" on ADO FM (May 23th, 2013). The themes was our scientifics works.
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