How and why did the United States come to have four time zones? Learn about how cities and railroad travel impacted the development of these zones. Includes video (requires RealPlayer).

Do you wake up at the crack of dawn, or do you need an alarm clock to wake you up each morning? It may surprise you that the two are not always in synch. Nowadays, we use Standard Time to set our watches instead of Solar Time. Which...

This animated video explains the relationship between time zones and trains. If you live in the United States, you live in one of the standardized time zones. But these time zones have not always been around. In fact, it's a fairly...

Here you will find the story of how and why time zones came about and the Canadian who developed the system that has become so important around the world. Be sure to read the "Incidents and Anecdotes" section to find interesting facts...

This is a free site which began with the World Clock, and has grown to include many other wonderful tools for learning about time and date. what makes this site distinctive, is its ability to manipulate the perspective internationally to...

Use this NOVA lesson to discuss the nature of time and the grandfather paradox. Examine time from different perspectives by plotting ages on a timeline, estimating how long a minute is and imagining going back in time to change something...

This site from Time Zones for PCs provides a colorful, interactive maps of the United States and the world. Click on one of the starred cities to find out what time it is there.

Wind is air moving from a place that has higher pressure to one that has lower pressure. Sometimes wind is just a light breeze and other times it is strong enough to blow the roofs off buildings.