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The Stem of Skyscrapers
Since builders broke ground on the first skyscraper in 1884, engineers and architects have continued to pioneer exciting innovations as they literally reach for the sky. Give your …
Military Force
The question of when to use military force is one of the most difficult that democracies face. What exactly constitutes self-defense and whether to intervene in a humanitarian …
A Day with a Librarian
Experts in the field of information science, librarians do much more than manage the checking out of books. This guidebook explores how librarians create welcoming, inclusive hubs …
The Stem of High-Speed Trains
At top speeds of more than 250 miles per hour, high-speed trains are designed to carry passengers over long distances quickly and safely. Readers will explore how trains have …
Voter Disenfranchisement
Voter disenfranchisement occurs when people who have the right to vote are prevented from doing so. Students study its ugly history in the South but rarely learn about worrisome …
Colorado (ARC Edition): The Centennial State
How Are Smartphones Made and Sold?
The world's largest smartphone assembly plant produces nearly 150,000 smartphones a day. Factories specialize in individual components, like cameras, chips, and phone cases, which …
Information and Action: Using Variables
In computer science, variables are the system for storing, labeling, and retrieving information programmatically. Where information is stored and how it is labeled is important. …