LyrArc Article Gist
Most questions about the vaccines from Oxford, Pfizer and Moderna are answered in this Q&A in The Times. 

The Oxford vaccine is the only vaccine that is being provided at cost to the public at a cost of 4 pounds, Pfizer using German technology at 15 pounds and Moderna from Cambridge, Massachusetts, at 28 pounds. The Oxford vaccine can be stored in a fridge, the others use mRNA technology of messenger RNA which requires ultra low temperature storage.

Astra Zeneca could have handled the trials and methodology for results in a better way. As the two trials one that produced results of 62% and the other results of 90% cannot be combined to give results of 70% but are two distinct and separate trials. However too much emphasis has been placed on the vaccine, as other prevention measures remain important for 2021. Other vaccines are being developed in Britain with new technology and in India by ICMR which are in trials stage and about which not enough is known. The Russian and Chinese vaccines have not released detailed data limiting their use around the world.