Allan MacDonald

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Introduction References & Edit History Quick Facts & Related Topics

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Highway Night Traffic Portland, drive, driving, car, automobile.

What's the Difference Between Speed and Velocity?

Smoke rises from the sniper's gun as he fired from the tower of the University of Texas administration building in Austin, on crowds below. Police identified the slayer of at least 16 persons as Charles J. Whitman (Charles Whitman), 24,

50th Anniversary of Texas Tower Shooting

Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64

Gravity: From Apples to the Universe

Discover

World Data Locator Map: Australia

Is Australia an Island?

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

What If the President Is Impeached?

Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

Why Is Christmas in December?

Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society

The 10 Greatest Basketball Players of All Time

Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

The Largest Islands in the World

Stylish light blue jeans on wooden background, closeup of inset pocket

Why Do Jeans Have That Tiny Pocket?

Allan MacDonald: References & Edit History

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Assorted References

Bistritzer
- In Rafi Bistritzer

Article Contributors

Primary Contributors

Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the Astrophysical Journal. Prior to that, he worked at McMaster University on the ODIN radio astronomy satellite project.

Article History

Type	Description	Contributor	Date
	New article added.	Erik Gregersen	Jan 26, 2024