Girls feel less 'smart' than boys by age 6, research says

By Juliet Perry and Meera Senthilingam, CNN

Updated 12:01 PM ET, Fri January 27, 2017

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Chinese-American physicist Chien-Shiung Wu (1912-1997) focused her research predominantly on the techniques of experimental physics and radioactivity. She was known for her work on the Manhattan Project, which produced the first nuclear weapon during World War II. Her nicknames included the "First Lady of Physics", "Chinese Marie Curie" and "Madame Wu".
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Chien-Shiung Wu – Chinese-American physicist Chien-Shiung Wu (1912-1997) focused her research predominantly on the techniques of experimental physics and radioactivity. She was known for her work on the Manhattan Project, which produced the first nuclear weapon during World War II. Her nicknames included the "First Lady of Physics", "Chinese Marie Curie" and "Madame Wu".
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Polish-born French physicist Marie Curie (1867-1934) discovered polonium and radium. Her work led to the creation of X-rays -- a crucial component of modern-day medicine. She was the first woman to win a Nobel Prize and the only woman to win this award in two categories: Physics and Chemistry.
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Marie Curie – Polish-born French physicist Marie Curie (1867-1934) discovered polonium and radium. Her work led to the creation of X-rays -- a crucial component of modern-day medicine. She was the first woman to win a Nobel Prize and the only woman to win this award in two categories: Physics and Chemistry.
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American Alice Hamilton (1869-1970) was a pioneer in the field of toxicology. She researched the effects of lead poison on factory workers, isolated a typhoid fever outbreak in 1902, and lent her expertise to help crack down on the sale of cocaine to children in Chicago. She was also the first female faculty member of <a href="http://hms.harvard.edu/" target="_blank">Harvard Medical School.</a>
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Alice Hamilton – American Alice Hamilton (1869-1970) was a pioneer in the field of toxicology. She researched the effects of lead poison on factory workers, isolated a typhoid fever outbreak in 1902, and lent her expertise to help crack down on the sale of cocaine to children in Chicago. She was also the first female faculty member of Harvard Medical School.
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Austrian physicist Lise Meitner (1878-1968) was a key member of a small group of scientists who discovered nuclear fission. Notably, one of her colleagues and her long-time collaborator, Otto Hahn, was awarded the 1944 Nobel Prize in Chemistry for their work on nuclear fission. Meitner's exclusion has since been considered to be an error by the Nobel committee.
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Lise Meitner – Austrian physicist Lise Meitner (1878-1968) was a key member of a small group of scientists who discovered nuclear fission. Notably, one of her colleagues and her long-time collaborator, Otto Hahn, was awarded the 1944 Nobel Prize in Chemistry for their work on nuclear fission. Meitner's exclusion has since been considered to be an error by the Nobel committee.
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German embryologist Hilde Mangold (1898-1924), along with Hans Spemann, discovered the embryonic organizer. Their work led to further understanding of the pattern of embryo differentiation in all amphibians and formed the foundation for the field of experimental embryology. Mangold died young, but in 1935 Spemann was awarded the Nobel prize in Physiology or Medicine for their discovery.
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Hilde Mangold – German embryologist Hilde Mangold (1898-1924), along with Hans Spemann, discovered the embryonic organizer. Their work led to further understanding of the pattern of embryo differentiation in all amphibians and formed the foundation for the field of experimental embryology. Mangold died young, but in 1935 Spemann was awarded the Nobel prize in Physiology or Medicine for their discovery.
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American marine biologist and conservationist Rachel Carson (1907-1964) was also an author. After WWII, she focused on warning the public about the long-term effects of misusing pesticides. Her book Silent Spring and other works challenged the practices of agricultural scientists and are credited with advancing the global environmental movement.
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Rachel Carson – American marine biologist and conservationist Rachel Carson (1907-1964) was also an author. After WWII, she focused on warning the public about the long-term effects of misusing pesticides. Her book Silent Spring and other works challenged the practices of agricultural scientists and are credited with advancing the global environmental movement.
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Italian neuroscientist Rita Levi-Montalcini (1909-2012) was known for her work in neurobiology. Along with Stanley Cohen, she won the 1986 Nobel Prize in Physiology or Medicine for their discovery of nerve growth factor, a protein controlling growth and development. Prior to her death in 2012, she was the oldest living Nobel laureate and first ever to reach their 100th birthday.
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Rita Levi-Montalcini – Italian neuroscientist Rita Levi-Montalcini (1909-2012) was known for her work in neurobiology. Along with Stanley Cohen, she won the 1986 Nobel Prize in Physiology or Medicine for their discovery of nerve growth factor, a protein controlling growth and development. Prior to her death in 2012, she was the oldest living Nobel laureate and first ever to reach their 100th birthday.
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