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Feynman replaces complex numbers with spinning arrows, which start at emission and ends at detection of a particle. The sum of all resulting arrows represents the total probability of the event. In this diagram, light emitted by the source S bounces off a few segments of the mirror (in blue) before reaching the detector at P. The sum of all paths must be taken into account. The graph below depicts the total time spent to traverse each of the paths above.
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A section of the Tarantula Nebula in the constellation Dorado
Image credit: NASA/ESO/ESA
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April 21, 1989: Tiananmen Square Protests Begin
On this day in 1989, students began protesting in Tiananmen Square in Beijing, the symbolic central space of China. Several weeks later, when the government sent in the army to end the demonstrations, the citizens of Beijing poured into the streets in support of the students.
The demonstrations ended in a massacre on the night of June 3-4, when the government sent the troops into the city with orders to clear Tiananmen Square. One day later, a single, unarmed young man stood his ground before a column of tanks on the Avenue of Eternal Peace. Captured on film and video by Western journalists, this extraordinary confrontation became an icon of the struggle for freedom around the world.
In 2012, FRONTLINE took a look back at how the iconic image of the “tank man” came to be, more than twenty years after the massacre at Tiananmen Square.
Photo: A Chinese man stands alone to block a line of tanks heading east on Beijing’s Changan Blvd. in Tiananmen Square on June 5, 1989. (AP/Jeff Widener)
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The abandoned film setting of the town of Spectre from the movie ‘Big Fish’. Source.
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Yesterday, Arthur and I took a drive out to the Culmstock Beacon area.
Society6 | Instagram | Twitter | DeviantART
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Manhattan, viewed from the ISS on January 9, 2014, photographed by one of the Expedition 38 crew members. (NASA)
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