Rediscovering Biology Great advances have been made in the field of biology in recent decades that will continue to have a major impact on our lives. This course will help new and veteran biology teachers become familiar with current research methods and tools that will lead to new discoveries in the coming decades.

Choose One Interactives Home Math Interactives -Geometry 3D Shapes -Math in Daily Life -Metric Conversions -Statistics Language Interactives -Elements of a Story -Historical and Cultural -Literature -Spelling Bee Arts -Cinema History Interactives -Collapse -Middle Ages -Renaissance -U.S. History Map Science Interactives -Amusement Park Physics -DNA -Dynamic Earth -Garbage -Periodic Table -Rock Cycle -Volcanoes -Weather Why do windy winter days seem so bitterly cold? A winter day with a strong wind can seem much colder than one with only a mild wind, though the air temperature may be exactly the same. The effect that wind has on our perception of cold is called the wind chill factor. The greater the wind speed, the faster we lose body heat. Wind chill can make a fairly moderate winter day equivalent to a much colder one—sometimes dangerously so. For example, a day with a temperature of 30 ° Fahrenheit might seem of little concern, but combined with winds of 10 miles per hour, it can feel like it's only 21° Fahrenheit. Try it yourself. Calculate the wind chill factor for various combinations of temperature and wind speed using the calculator below. Calculate the wind chill factor Temperature (in degrees Fahrenheit): Choose a temperature 35 30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35 Wind speed (in miles per hour): Choose a wind speed 5 10 15 20 25 30 35 40 45   "Weather" is inspired by programs from Planet Earth. Home | Channel | Catalog | About Us | Search | Contact Us | Site Map © 1997-2008 Annenberg Media. All rights reserved. Legal Policy