Hindu devotees hold a placard and pray to pay tributes outside a temple in Ahmedabad to victims of Allahabad stampede- PTI

Hindu devotees hold a placard and pray to pay tributes outside a temple in Ahmedabad to victims of Allahabad stampede. PTI

Hindu devotees hold a placard and pray to pay tributes outside a temple in Ahmedabad to victims of Allahabad stampede. PTI

On the first day of American President Barack Obama’s visit to India, the two most commonly used words were chemistry and optics.

January 27, 2015, was an eventful day. A few events took place almost simultaneously on this day that are likely to impact the future of India’s security and economy.