Virology in order to immunize others. In 1717 Lady Mary Wortley Montagu observed the practice in Istanbul and attempted to popularize it in Britain, but encountered considerable resistance. In 1796 Edward Jenner developed a much safer method, using cowpox to successfully immunize a young boy against smallpox, and this practice was widely adopted. Vaccinations against other viral diseases followed, including the successful rabies vaccination by Louis Pasteur in 1886. The nature of viruses however was not clear to these researchers. In 1892, the Russian biologist Dmitry Ivanovsky used a Chamberland filter to try to isolate the bacteria that caused tobacco mosaic
To the Youth in Western Countries the evolution of terroristic groups like al-Qaeda, the Taliban, and ISIL—"the spawn of such ill-fated pairings with imported cultures." Khamenei also pointed out the "oppressed people of Palestine", who "have experienced the worst kind of terrorism for the last 60 years." For this, he criticised Israel, its allies and international organisations. Twitter accounts that tweeted the letter were reported to have been temporarily suspended for sending spam messages. Some were reactivated with apologies from the network and a warning about sending similar messages again. This sometimes led to multiple resuspensions. To the Youth in Western Countries On 29 November 2015,