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Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963

Was Martin Luther King, Jr., a Republican or a Democrat?

The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

The Lost Colony of Roanoke

Washington, D.C. locator map.

What State Is Washington, D.C. In?

Alcoholic beverages bottles at Host 2013, international exhibition of the hospitality industry on OCTOBER 18, 2013 in Milan.

Why Is Alcohol Measured by Proof?

Flag of Bhutan

6 Small Kingdoms of the World

Abstract vector hi speed internet technology background

History of Technology Timeline

Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)

6 Cultures That Recognize More than Two Genders

white light: Media

optics

Images

prism spreading light

prism spreading light

A prism spreads white light into its various component wavelengths, or colours.

© Getty Images

visible spectrum of light

visible spectrum of light

When white light is spread apart by a prism or a diffraction grating, the colours...

Encyclopædia Britannica, Inc.