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Counting the Days
greek calendar

The ancients developed sophisticated mechanisms to keep track of important events, like  equinox rites or the next Olympics. As told below, Greeks had the Antikythera mechanism, a complex arrangement of gears that tracked the sun and moon. In this hemisphere, the Maya used math and astronomy to keep track of two separate calendars. Your students can, too.

Lesson: How Mayans Saved the Date

Chichen ItzaIn this lesson combining math, engineering, and history, students in grades 6-12 learn about the calendar system used by the third-century Maya of Central America. Students construct a simple model of a calendar round, learning about prime numbers and the mechanics of these ancient inventions.

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Feature: The Oldest Computer?

Ancient ComputerIn 1901, deep-sea divers discovered a Roman shipwreck (dated to around 70 B.C.) near Antikythera, a small island off the southern coast of Greece. Among the treasures was a small rusted machine that once contained a sophisticated array of cogs and wheels. Now researchers believe they know the purpose of this mysterious device. 

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K-12 News: AP Surge Questioned

test takingThe number of students taking Advanced Placement tests rose 50 percent in the last five years. For students seeking admission to selective colleges, it's the norm. But in the Harrisburg, Pa. area, some parents objected when a school district sought to introduce an AP course in 9th grade. 


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* 1 bonus teacher guide -- 6 pages of engaging classroom activities using the eGFI magazine, cards, and website

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About the eGFI Teachers' Newsletter

Delivered each week to your email inbox, our newsletter is packed with lesson plans and activities, resources, feature stories, and the latest developments in K-12 engineering education. eGFI is part of the American Society for Engineering Education (ASEE), a non-profit organization committed to enhancing efforts to improve STEM and engineering education.

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