Who is the couple behind Pfizer's COVID vaccine that could change the world?

Positive data on BioNTech and US partner Pfizer Inc's COVID-19 vaccine came as a happy surprise for not only the world, but also the married couple behind the German biotech firm. Physicians Ugur Sahin and Oezlem Tuereci, who bonded over their love of medical research, are the people behind the Covid-19 vaccine that could change the world.