Solar eclipse coming to US on April 8th- NASA has issued a warning
Solar eclipse coming April 8th
Millions could be in darkness, but experts warn of a big risk.
88% of US adults watched the last one
Full eclipse creates darkness in a narrow path
Special glasses are required to view safely
Looking without them can cause permanent eye damage
Texas likely to have cloudy skies during the eclipse
New York is expected to have the best viewing conditions