Daytona 500 grand marshal list: Actors, models, presidents who said, 'Drivers, start your engines'
When Great American Race takes off in Daytona Beach, Florida, Grand Marshal Anthony Mackie (Captain America) will say: ...
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'Iridescent' clouds on Mars captured in Martian twilight in stunning NASA rover images (video)
"I'll always remember the first time I saw those iridescent clouds and was sure at first it was some color artifact." ...