Espionage tactics have evolved in the mordern age, but traditional Cold War methods still present as much of a security threat as cyber attacks.

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Electronic communications devices like the blackberry and smart phones present unique security challenges when used by the president and his high-level staff.

Emergency evacuation and escape protocols keep the president safe in the event of a national crisis and were activated during the attacks of September 11th, 2001.

To ensure continuity of government in the event of a catastrophic attack on America, the president and high level government officials are briefed about a top secret Doomsday Plan.

In this video clip of Modern Marvels - Toilet Tech, find out the history the toilet. See how toilets were invented during the Roman Empire and then slowly progressed into the chamber pot and then the outhouse. Also, learn how present day toilet makers are making the toilets much more water efficient to help save the environment.

Presidential historian Doris Kearns Goodwin describes why taking some well-earned time off might just be the best thing a president—or anyone—can do to be better at their job.

America knew them as POTUS and FLOTUS, but here are the names they gave each other in private.