of light in the darkness. the answers do not come easy. but we can take solace knowing that even the darkest space can be brightened by a single light and even the most terrible despair can be illuminated by a single ray of hope. >> in las vegas, hundreds of people answering the cal t donate blood. liningup across the city. officials tellingele how they can help by posting the location of blood centers. this often happens, blood banks get overwhelmed with people donating. but consider living even if you don't live in vegas. consider when you have a spare hour in your day or when there's not a shooting or an attack. we'll have more stories of heroism and tales of strangers every day. you do have control over how you react to these things. unfortunately we cannot control