Sikh devotees march during a procession to mark the martyrdom of the ninth Sikh Guru Tegh Bahadur in New Delhi-AP

Sikh devotees march during a procession to mark the martyrdom of the ninth Sikh Guru Tegh Bahadur in New Delhi-AP

Sikh devotees march during a procession to mark the martyrdom of the ninth Sikh Guru Tegh Bahadur in New Delhi-AP

Technology

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.