Now we know how Rami Abdelrahman of Syrian Observatory for Human Rights calculates his estimates of casualties in Syria

"Rami Abdelrahman, of the UK-based Syrian Observatory for Human Rights, said the casualty figures were still unknown but added: "From looking at the videos I expect the death toll to be around or above 50, and not higher than 100. But for now I am keeping my estimate at dozens killed until we have more information.""  (thanks Ali)