Two days ago, Pfizer Inc and BioNTech announced that its experimental Covid-19 vaccine has shown 90% effectiveness at preventing symptomatic Covid-19 infection, based on initial trial results. The Ministry of Health says it will adopt a wait-and-see approach and plans to review the data first. But what we do know is that delivery and storage of the vaccine will present a challenge. The vaccine must be kept in a cold chain of below minus 70 degrees Celsius. Melisa Idris and Sharaad Kuttan bring you the most important news of the day.