input question: Answer this question: how many seasons heroes????
output answer: Four complete seasons aired, ending on February 8, 2010.

input question: Answer this question: what is the source of geothermal energy????
output answer: The Geothermal energy of the Earth's crust originates from the original formation of the planet (20%) and from radioactive decay of minerals (80%).

input question: Answer this question: what makes a dwarf planet????
output answer: More explicitly, the International Astronomical Union (IAU) defines a dwarf planet as a celestial body in direct orbit of the Sun that is massive enough for its shape to be controlled by gravitation , but that unlike a planet has not cleared its orbital region of other objects.

input question: Answer this question: where is the human thigh located?????
output answer:
The human leg is the entire lower extremity or limb of the human body , including the foot , thigh and even the hip or gluteal region; however, the precise definition in human anatomy refers only to the section of the lower limb extending from the knee to the ankle .