There is a festival in India so amazing that millions of people attend every year – despite the near certainty that many will die. Nilay Kulkarni grew up hearing the horror stories of human stampedes that claimed hundreds of lives annually.

With a desire to prevent what seemed inevitable, the guiding voice of his grandfather, a hackathon, and a set of black rubber mats, Kulkarni took on human stampedes. This episode of ‘Fixed That For You’ combines the science of crowd control with the power of a lifesaving DIY data collection tool.