Examine letters from 3rd graders expressing their opinions about Pluto's reclassification, starting in 2000. Note how their tone shifted over the years, as the public slowly came to accept Pluto's fall from planethood in 2006. Details »
Explore the planets and dwarf planets of the Solar System; learn about their discoveries, the origin of their names, distance from the sun, orbit length, number of moons, size and temperature. Hear scientists' opinions and vote for your favorite. Details »
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Find science, technology, engineering, and math resources for PreK-12 teachers and students.
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Take a look at how population growth and development affect the environment, and find ideas for maintaining this delicate balance.
Examine controversial issues brought about by technological advances in genetics, cloning, stem cell research, and reproductive medicine, and discuss the ethical issues behind the controversies.