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Tuskegee Syphilis Study: Failing to Treat Black Men for 40 Years

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The Tuskegee syphilis study, also known as the U.S. Public Health Service (USPHS) Untreated Syphilis Study at Tuskegee, is one of the most infamous chapters in the history of U.S. public health and scientific research. PHS, in collaboration with the Tuskegee Institute, conducted the study, which aimed to observe the natural history of untreated syphilis in Black men from Macon County, Alabama.

How Comets Work

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Comets are remarkable pieces of our universe's past, and they tell us a great deal about how the universe was formed. Learn about the long but rewarding process of discovering and analyzing comets.

Tau Herculids Meteor Shower Produced Shooting Stars, but no Meteor Storm

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The Tau Herculids meteor shower was made of debris from the broken comet SW3 and produced a lot of shooting stars, but not quite the meteor shower that was hoped for.

How Many Countries Are There in the World?

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It's a big old world and the number of countries it contains changes all the time. So, do you know how many there are? It's not an easy question.

How Yom Kippur Works

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Yom Kippur is considered by many Jews to be the holiest day of the Jewish year. Find out how Yom Kippur works and learn about the Yom Kippur celebration.

How Sunspots Work

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Sunspots are explained in this article. Learn about sunspots.

Can animals predict the weather?

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If animals predict the weather, could they save human lives? Learn if animals predict the weather, or if they have a meteorolgoical sixth sense.

Can You Get More Than 11 Right on This Astronomy Quiz?

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Does the solar system fill you with wonder? Are you an amateur stargazer fascinated by celestial bodies? Show off your knowledge of the universe with an out-of-this-world astronomy quiz!

Hubble Hubble: Telescope Provides Stunning New Images of Two Planetary Nebulas

science.howstuffworks.com/hubblenew-images-planetary-nebulas.htm

Astronomers used Hubble's full range of imaging to dissect wild 'fireworks' happening in two nearby young planetary nebulas.

What Is the Coldest Place in the Universe?

science.howstuffworks.com/coldest-place-in-universe.htm

The coldest place in the universe exists some 5,000 light-years from Earth. Do you know where it is and what it's called?

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