The Doomsday Clock moves closer to midnight as analysts debate nuclear deterrence effectiveness amid rising tensions with Russia over Ukraine and China's arsenal expansion.

The stewards of the clock meet annually to discuss re-setting the clock based on current world events. The Doomsday Clock was previously set at 100 seconds to midnight in 2020.

And even though the clock evokes a potentially terrifying future, Holz takes a more optimistic approach to the entire endeavor. “Really, the Doomsday Clock is a symbol of hope,” Holz says. “The whole ...

Jan. 14, 2010 -- Is humanity approaching an apocalypse? Today, a group of international scientists will move the hands of the symbolic "Doomsday Clock" for the first time in two years.