Science Festival, which was held at the Faculty of Electronics in Nish, (Serbia) was a special challenge for all of us. It was time to other students and their teachers and all interested visitors to show what we have learned about the application of mathematics in forensics. Students are presented as means of trigonometry can determine the angle of droplets of blood fell to the ground, and explaining what this information means in the investigation of a crime. Also, visitors are shown the thigh and the humerus, and how to use them is the height of the person whose bones were found. The visitors were determined by the height they measured the thigh or humerus.Many visitors were interested to see our presentation and we are very happy about it.