Middle East Respiratory Syndrome and the risks posed by massive gatherings of people, such as the Hajj

A careful review of threats leads the Bulletin's Science and Security Board to conclude that the risk of civilization-threatening technological catastrophe remains high, and that the hands of the Doomsday Clock should therefore remain at five minutes to midnight.

Chemical warfare is still alive and well in Syria and Iraq, because of an enduring belief among regional actors that chemical weapons will get the job done. 

The Russia-US deal to eliminate Damascus’ stockpile has achieved a great deal—far more than the alternative would have accomplished

The director-general of the Organization for the Prohibition of Chemical Weapons on Syria, terrorists looking for chemical weapons, and the need to watch out for weapons that haven't even been invented yet