Walking through the ancient Nabataean city of Petra can be a challenge. A tour begins with a 20-minute walk down a rocky slope through the narrow Siq to get to the famous Treasury known to Indiana Jones fans. But that is...

Twenty-nine percent of Americans want to abolish the one-cent coin, which begs the question: Is a penny saved really a penny earned? Scholars read fascinating facts about the history of the penny in preparation for a class debate or...

This TV 411 segment features a lesson from Question Man on how to informally calculate 15% tips at restaurants.

In this Cyberchase video segment, the CyberSquad uses fractions and percents to compare the contest results of the Squitters, little creatures who love to jump.

The BLM manages one in every 10 acres of land in the United States, and approximately 30 percent of the Nation's minerals. These lands and minerals are found in every state in the country and encompass forests, mountains, rangelands,...

[Free Registration/Login Required] A huge resource for researchers without GIS capabilities who need data on population and land area by country across a range of physical characteristics. These include measures such as the number of...

Provides a Carbon 14 Dating Calculator to compute the percent of Carbon 14 remaining after a given number of years. Also calculates how many years have elapsed from how much Carbon 14 remains.

Get the facts about seabirds. This group of birds makes up about three percent of the various species, even though two-thirds of the Earth is covered in water. Learn some unique facts and characteristics of seabirds. Also included in...

Certain plants are known for their eye-catching blooms. Think of roses, orchids, carnations, and tulips. We often refer to these plants as "flowers." A flower, though, is just one part and quite an important part of a plant. Not all...

Wetland ecosystems are extremely valuable to wildlife, supporting a greater number of animals than any other type of habitat. Wetlands also absorb flood waters; filter chemicals, sediments, and other impurities out of drinking water;...

Here's a concise timeline that highlights the important facets of reconstruction from the announcement of Abraham Lincoln's reconstruction plans to the end of reconstruction at the election of Rutherford B. Hayes.