Before iPhones and calendars, how did humans determine the seasons of the year? Middle school scientists discover how to use shadows to determine the time of year in an enlightening interactive. Pupils manipulate the sun and examine the...

Do you think you are a time expert? Let's put your skills to the test with this conversion activity. We are going to give you some crazy number of days and you need to turn it into a week value that is easier to understand. You're going...