With Google Earth, you can type in an address and see pictures of that location.  That handy function may have had an unintended effect when it revealed a secret US drone base in Yucca Lake, Nevada.  How easy is it to find undisclosed military locations?  What other "black spots" can we see?  And what does that say about how easily folks overseas can peek at our bases?  Aerospace and Area 51 historian Peter Merlin weighs in.

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Peter Merlin, aerospace historian and author, Images of Aviation: Area 51

• RT: Google unEarths image of secret US drone base in Nevada