Question:
The Joker is a fictional supervillain created by Bill Finger, Bob Kane, and Jerry Robinson who first appeared in the debut issue of the comic book Batman (April 25, 1940), published by DC Comics. Credit for the Joker's creation is disputed; Kane and Robinson claimed responsibility for the Joker's design, while acknowledging Finger's writing contribution. Although the Joker was planned to be killed off during his initial appearance, he was spared by editorial intervention, allowing the character to endure as the archenemy of the superhero Batman. In his comic book appearances, the Joker is portrayed as a criminal mastermind.
The Joker debuted in Batman #1 (Spring 1940) as the eponymous character's first villain, shortly after Batman's debut in Detective Comics #27 (May 1939). The Joker initially appeared as a remorseless serial killer, modeled after a joker playing card with a mirthless grin, who killed his victims with "Joker venom": a toxin which left their faces smiling grotesquely. The character was intended to be killed in his second appearance in Batman #1, after being stabbed in the heart. Finger wanted the Joker to die because of his concern that recurring villains would make Batman appear inept, but was overruled by then-editor Whitney Ellsworth; a hastily drawn panel, indicating that the Joker was still alive, was added to the comic. The Joker went on to appear in nine of Batman's first twelve issues.  The character's regular appearances quickly defined him as the archenemy of the dynamic duo, Batman and Robin; he killed dozens of people, and even derailed a train. By issue #13, Kane's work on the syndicated Batman newspaper strip left him little time for the comic book; artist Dick Sprang assumed his duties, and editor Jack Schiff collaborated with Finger on stories. Around the same time, DC Comics found it easier to market its stories to children without the more mature pulp elements that had originated many superhero comics. During this period, the first changes in the Joker began to appear, portraying him more as a prankster than threat; when he kidnaps Robin, Batman pays the ransom by check, meaning that the Joker cannot cash it without being arrested. Comic book writer Mark Waid suggests that the 1942 story "The Joker Walks the Last Mile" was the beginning point for the character's transformation into a more goofy incarnation, a period that Grant Morrison considered lasted the following thirty years.  The 1942 cover of Detective Comics #69, known as "Double Guns" (with the Joker emerging from a genie lamp, aiming two guns at Batman and Robin), is considered one of the greatest superhero comic covers of the Golden Age and is the only image of the character using traditional guns. Robinson said that other contemporary villains used guns, and the creative team wanted the Joker--as Batman's adversary--to be more resourceful.
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What else can you tell me about the joker?

Answer:
The character was intended to be killed in his second appearance in Batman #1,


Question:
Duncan began her dancing career at a very early age by giving lessons in her home to neighbourhood children, and this continued through her teenage years. Her novel approach to dance was evident in these early classes, in which she "followed [her] fantasy and improvised, teaching any pretty thing that came into [her] head". A desire to travel brought her to Chicago, where she auditioned for many theater companies, finally finding a place in Augustin Daly's company. This took her to New York City where her unique vision of dance clashed with the popular pantomimes of theater companies.
Breaking with convention, Duncan imagined she had traced dance to its roots as a sacred art. She developed from this notion a style of free and natural movements inspired by the classical Greek arts, folk dances, social dances, nature and natural forces as well as an approach to the new American athleticism which included skipping, running, jumping, leaping and tossing.  Duncan's philosophy of dance moved away from rigid ballet technique and towards what she perceived as natural movement. To restore dance to a high art form instead of merely entertainment, she strove to connect emotions and movement: "I spent long days and nights in the studio seeking that dance which might be the divine expression of the human spirit through the medium of the body's movement." She believed dance was meant to encircle all that life had to offer--joy and sadness. Duncan took inspiration from ancient Greece and combined it with an American love of freedom. Her movement was feminine and arose from the deepest feelings in her body. This is exemplified in her revolutionary costume of a white Greek tunic and bare feet. Inspired by Greek forms, her tunics also allowed a freedom of movement that corseted ballet costumes and pointe shoes did not. Costumes were not the only inspiration Duncan took from Greece: she was also inspired by ancient Greek art, and utilized some of its forms in her movement (see image).  Duncan wrote of American dancing: "let them come forth with great strides, leaps and bounds, with lifted forehead and far-spread arms, to dance." Her focus on natural movement emphasized steps, such as skipping, outside of codified ballet technique. Duncan also cited the sea as an early inspiration for her movement. Also, she believed movement originated from the solar plexus, which she thought was the source of all movement. It is this philosophy and new dance technique that garnered Duncan the title of the creator of modern dance.
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what was the concept of her philosophy?

Answer:
Duncan's philosophy of dance moved away from rigid ballet technique and towards what she perceived as natural movement.