TED-Ed
TED-Ed: Can you solve the fortress riddle? | Henri Picciotto
Bad news: your worst enemies are at the gate. Your fledgling kingdom guards the world's only herd of tiny dino creatures. To you, they're sacred. To everyone else, they're food. The three closest nation-states have teamed up to smash...
TED Talks
Adam Savage: How simple ideas lead to scientific discoveries
Adam Savage walks through two spectacular examples of profound scientific discoveries that came from simple, creative methods anyone could have followed -- Eratosthenes' calculation of the Earth's circumference around 200 BC and...
TED-Ed
TED-Ed: How simple ideas lead to scientific discoveries - Adam Savage
Adam Savage walks through two spectacular examples of profound scientific discoveries that came from simple, creative methods anyone could have followed -- Eratosthenes' calculation of the Earth's circumference around 200 BC and...
Curated Video
History of Maps: How Eratosthenes Became the Father of Geography
Find out how Greek mathematician and astronomer Eratosthenes came to be known as the Father of Geography. People and places - Mapping - History of maps A Twig Tidbit Film - Clip. A short film that extends the learning beyond the curriculum.
Professor Dave Explains
History of Astronomy Part 2: Early Measurements of the Earth
After many centuries of pure observation, it finally became time for mankind to start doing some science to figure out the dimensions of the Earth and other nearby objects. What were these early experiments? What did they tell us? Let's...
Center for Innovation in Engineering and Science Education, Stevens Institute of Technology
Ciese Collaborative Projects: Noon Day Project
The Noon Day Project is a collaborative internet project for students to recreate Eratosthenes first measurement of the Earth's north-south circumference. Participate in the next project session, or review the data presented in the...
Other
Mathematics Peepshow: Eratosthenes
Watch and discover all the major achievements and famous Greek mathematician Eratosthenes. [2:16]
Loyola University Chicago
Math Flix: Prime Numbers: Sieve of Eratosthenes Part 2
This QuickTime movie continues using a hundreds chart to record all the prime numbers between 1 and 100 by eliminating all the composite numbers. As you watch and listen to the teacher and students interact it helps clarify the thinking...
Loyola University Chicago
Math Flix: Prime Numbers: Sieve of Eratosthenes Part 1
This QuickTime movie uses a hundreds chart to record all the prime numbers between 1 and 100 by eliminating all the composite numbers. A pdf worksheet is available by clicking on the hyperlink at the bottom of the page. As you watch and...
Khan Academy
Khan Academy: Primality Test With Sieve
This video lesson demonstrates an attempt at an optimal trial division primality test that uses the Sieve of Eratosthenes. This video lesson from Khan Academy is intended for students who are taking an introductory computer science course.
Khan Academy
Khan Academy: Sieve of Eratosthenes
This video lesson discusses the Sieve of Eratosthenes, a method that allows people to generate a list of primes. This video lesson from Khan Academy is intended for students who are taking an introductory computer science course.