PBS
Pbs Learning Media: A Tip on Tipping
This TV 411 segment features a lesson from Question Man on how to informally calculate 15% tips at restaurants.
Texas Education Agency
Texas Gateway: Humidity, Evaporation, and Boiling
Learn about the relationship between vapor pressure of water and capacity of air to hold water vapor, the relationship between relative humidity and partial pressure of water vapor in the air, and how to calculate vapor density,...
University of Nebraska
Carbon 14 Dating Calendar
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.