prompt: Convert the key points of this article into frequently asked questions (FAQ) with answers.
  
  A new study has shown that humans may have evolved a spring-like arch to help us walk on two feet. Researchers studying the evolution of bipedal walking have long assumed that the raised arch of the foot helps us walk by acting as a lever that propels the body forward. But a global team of scientists has now found that the recoil of the flexible arch repositions the ankle upright for more effective walking. The effects in running are greater, which suggests that the ability to run efficiently could have been a selective pressure for a flexible arch that made walking more efficient too. This discovery could even help doctors improve treatments for present-day patients' foot problems.
  
  "We thought originally that the spring-like arch helped to lift the body into the next step," said Dr. Lauren Welte, first author of the study in Frontiers in Bioengineering and Biotechnology, who conducted the research while at Queen's University and is now affiliated with the University of Wisconsin-Madison. "It turns out that instead, the spring-like arch recoils to help the ankle lift the body.
chosen.role: system
chosen.content: A chat.
chosen.role: user
chosen.content: Convert the key points of this article into frequently asked questions (FAQ) with answers.
  
  A new study has shown that humans may have evolved a spring-like arch to help us walk on two feet. Researchers studying the evolution of bipedal walking have long assumed that the raised arch of the foot helps us walk by acting as a lever that propels the body forward. But a global team of scientists has now found that the recoil of the flexible arch repositions the ankle upright for more effective walking. The effects in running are greater, which suggests that the ability to run efficiently could have been a selective pressure for a flexible arch that made walking more efficient too. This discovery could even help doctors improve treatments for present-day patients' foot problems.
  
  "We thought originally that the spring-like arch helped to lift the body into the next step," said Dr. Lauren Welte, first author of the study in Frontiers in Bioengineering and Biotechnology, who conducted the research while at Queen's University and is now affiliated with the University of Wisconsin-Madison. "It turns out that instead, the spring-like arch recoils to help the ankle lift the body.
chosen.role: assistant
rejected.role: system
rejected.content: A chat.
rejected.role: user
rejected.content: Convert the key points of this article into frequently asked questions (FAQ) with answers.
  
  A new study has shown that humans may have evolved a spring-like arch to help us walk on two feet. Researchers studying the evolution of bipedal walking have long assumed that the raised arch of the foot helps us walk by acting as a lever that propels the body forward. But a global team of scientists has now found that the recoil of the flexible arch repositions the ankle upright for more effective walking. The effects in running are greater, which suggests that the ability to run efficiently could have been a selective pressure for a flexible arch that made walking more efficient too. This discovery could even help doctors improve treatments for present-day patients' foot problems.
  
  "We thought originally that the spring-like arch helped to lift the body into the next step," said Dr. Lauren Welte, first author of the study in Frontiers in Bioengineering and Biotechnology, who conducted the research while at Queen's University and is now affiliated with the University of Wisconsin-Madison. "It turns out that instead, the spring-like arch recoils to help the ankle lift the body.
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