To celebrate Fathers' Day, the greatest dads in history—William Shakespeare, Frederick Douglass, and many more—offer their best pieces of parenting advice.

To celebrate Fathers' Day, the greatest dads in history—William Shakespeare, Frederick Douglass, and many more—offer their best pieces of parenting advice.
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Anyone can find the Golden Gate Bridge or Alcatraz, but if you’re willing to embrace the unknown, you’ll find that San Francisco is full of hidden gems.