Within hours of Superstorm Sandy slamming the East Coast two years ago, Americans opened their wallets to help — donating millions to the first charity that came to mind: the American Red Cross.

STOCK PHOTO/Getty Images Donors with Type O blood are the most needed right now, according to the Red Cross, for two reasons. Type O is the most common blood type, meaning that most people in need ...

STOCK PHOTO/Getty Images The Red Cross said it experienced a 7,000-unit shortfall between Christmas and New Year's Day and challenges including respiratory virus season and winter weather could ...