Pfizer-BioNTech release new efficacy data; Girish Mathrubootham, Manav Garg start 'Together'; and Beerud Sheth on the rise of Gupshup

The Pfizer-BioNTech Covid-19 vaccine's protection against severe cases of the disease holds steady after six months, according to new data released by the companies. The vaccine's efficacy against those severe cases stayed high at 97 percent for the entire six-month stretch after people got their shots. And in our tech conversation today, Beerud Sheth talks about building Gupshup into a leader in the conversational AI space