In 1954, John C. Lilly developed the isolation tank to test the effects of sensory deprivation. Such tanks are intended to completely deprive the brain of any external stimulation; they are lightless, soundproof, and filled with warm saltwater to promote flotation and reduce skin sensation. Isolation tanks are now used for meditation, relaxation, and in alternative medicine. A therapeutic session typically lasts an hour, and it is reportedly common to experience what during the first 40 minutes?
Back in the day
The Treaty of Madrid was an early agreement between the fledgling nation of the United States and the colonial power of Spain. The treaty defined the boundaries between the US and Spanish colonies to the south and west, and it secured the US rights to navigate the Mississippi River, which was a critical waterway for trade in the West. The signatories also agreed not to incite native tribes to warfare. The borders defined by this treaty correspond to what boundaries today?
Born on a day like today
A hero of the Spanish-American War, Roosevelt served as governor of NY and, later, as vice president under William McKinley. After McKinley's assassination, he became the 26th president of the US. His administration was marked by the regulation of trusts, the building of the Panama Canal, and a foreign policy based on the motto "Speak softly and carry a big stick." He won the 1906 Nobel Peace Prize for his mediation in the Russo-Japanese War. What was his relation to Franklin D. Roosevelt?