Nepalese villagers wave after collecting aid dropped by an Indian helicopter in Khanigaun, Nepal. David Ramos/Getty Images hide caption

itoggle caption David Ramos/Getty Images

This is an artist's imaginative rendering of an atom, but quantum mechanics makes it hard to imagine exactly what an atom is. Richard Graham Farmer/Science Photo Library/Corbis hide caption

itoggle caption Richard Graham Farmer/Science Photo Library/Corbis

New England Patriots quarterback Tom Brady gestures during an event at Salem State University in Salem, Mass. on May 7, 2015. An NFL investigation has found that New England Patriots employees likely deflated footballs and Brady was "at least generally aware" of the rules violations. Now, he faces a four-game suspension and the Patriots a $1 million fine. Charles Krupa/AP hide caption

itoggle caption Charles Krupa/AP