Coördinaten : Billy Bug Klik op de pijltjestoetsen om Billy te verplaatsen. Verplaats hem naar de juiste coördinaten zodat hij bij het eten kan. Klik op 'feed' en hij eet het op. Hoe snel kan je Billy tien keer voederen?
Klik op de pijltjestoetsen om Billy te verplaatsen. Verplaats hem naar de juiste coördinaten zodat hij bij het eten kan. Klik op 'feed' en hij eet het op.
Hoe snel kan je Billy tien keer voederen?
The effects of acid rain on a stream in the forest
Cars and power plants that burn fossil fuels release smoke that is full of chemicals. These chemicals float into the atmosphere, get trapped in clouds, and make the rain more acidic. This is known as acid rain.
Sonia Sanchez: The Meaning of Malcolm X
Poet Sonia Sanchez, interviewed here for Eyes on the Prize, describes what the outspoken civil rights leader Malcolm X represented to African Americans in the 1960s.
Students learn about weight and drag forces by making paper helicopters and measuring how adding more weight affects the time it takes for the helicopters to fall to the ground.
Students design and build a paper rocket around a film canister, which is used as the engine. An antacid tablet and water are put into the canister, react to form carbon dioxide gas, and act as the pop rocket's propellant. With the lid snapped on, the continuous creation of gas causes pressure to build up until the lid pops off, sending the rocket into the air. The pop rockets demonstrate Newton's third law of motion: for every action, there is an equal and opposite reaction.
Come On Over Rover
Have you ever wondered why it takes such a long period of time for NASA to build space exploration equipment? What is involved in manufacturing and building a rover for the Red Planet? During this lesson, students will discover the journey that a Mars rover embarks upon after being designed by engineers and before being prepared for launch. Students will investigate the fabrication techniques, tolerance concepts, assembly and field-testing associated with a Mars exploratory rover.
Midwest Snow Belt Flyover: March 13, 2000
SeaWiFS true color image of a Midwest snow belt taken on March 13, 2000
Great Zoom out of Sabie River, Africa (EOS Land Validation Site)
Using data from different spacecraft and some powerful computer technology, visualizers at the Goddard Space Flight Center present you with a collection of American cities in a way you have never seen them before. Starting with our camera high above the Earth, we rush in towards the surface at what would be an impossible speed for any known vehicle. Passing though layers of atmosphere, the colors of our destinations shimmer with their own unique characteristics, and suddenly we find ourselves fl
Martha Leads the Charge
While General George Washington commanded the troops in the field, Martha led the charge at home. Historic Interpreter Lee Ann Rose describes the impact women made during the Revolution.Author(s):
The Revolutionary Origins of the Civil War
Abraham Lincoln makes good on the founders' promises of freedom and equality. Author Gordon Wood lays out the Revolutionary origins of the Civil War.
Immortal Bricks and Mortar
Buildings bear silent witness to the history that happens inside them. Conservator Matt Webster makes sure structures live to tell their tales.Author(s):
Women of the Revolution
Could the war have been won without women? Author and Professor Holly Mayer thinks not. Learn more about the inner workings of the Continental Army.
What Makes a Good President?
Author and historian Alan Brinkley shares his thoughts on the alchemy of luck and chance in the Oval Office.Author(s):
African American history is both discovered in and continued by an ancient oral tradition. Richard Josey describes the process of restoring a community's voice.
Age of Piracy
Pirates seek treasure both sunken and sea-going, from the 17th century through today. William and Mary Professor Kris Lane draws the connections between the old traditions and the fresh emergences of piracy.Author(s):
Washington's Whiskey Still
George Washington's retirement venture had a high alcohol content. Mount Vernon's Director of Preservation, Dennis Pogue, leads us on a tour through Washington's whiskey distillery.Author(s):
A Tribal Relic Returns
A lost relic returns to the Pamunkey tribe in a new form. American Indian Initiative Manager Buck Woodard guides us through treaties and time.
Meet the Weaver
War makes the weaver busy. Cloth for everything from sails to bedsheets is created on his loom. Max Hamrick weaves the tale.Author(s):
Arsenal of War
A new armoury complex takes shape on the footings of Anderson's Forge. Archaeologist Meredith Poole talks about the site's rebuilt narrative.