This short video and interactive assessment activity is designed to give fourth graders an overview of 24-hour clocks.

After completing the various activities in this lesson, students will be able to understand the importance for a healthy body to be able to do an activity for 1 - 5 minutes.

After setting various times on their clocks, students will record the events of the day on a "My Day" worksheet.

A plot of luminosity vs. time is a ‘light curve’. In this laboratory, we will use a light curve to determine the diameter of two stars in a binary system.  --------------------------------------- Distant Nature: Astronomy Exercises 2016 by Stephen Tuttle under license "Creative Commons Attribution Non-Commercial Share Alike".

Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction. Created by Sal Khan.

This lesson will help children relate the concepts of past, present and future to their own lives. This lesson will be 45 minutes and include discussions, book reading and coloring. The children will learn the vocabulary words: time, yesterday, today and tomorrow. They will be able to relate this to personal experiences in their own lives. Materials:CalendarWhite board, white board markersHoughton Mifflin Social Studies Teacher Edition Level K My WorldWorksheets for all 15 studentsPencils and crayonsBig Ideas / Essential Questions:What is the difference between last year, this year and next year?Can you describe some of these differences using examples from your own life? 

This short video and interactive assessment activity is designed to teach second graders an overview of am and pm.

This short video and interactive assessment activity is designed to teach fifth graders about total length - challenge problems.

This short video and interactive assessment activity is designed to teach fourth graders about time and rate problems.

This short video and interactive assessment activity is designed to teach fourth graders about determining task length.

This Cyberchase video segment features Bianca, who must figure out the fastest route to a movie premiere.

This site houses a large number of very brief audio files in which native speakers say brief, useful, every day phrases in a number of conjugations. Phrases include things like "How much is this?" "How are you?" or simply reciting useful vocabulary and also cover numbers and time. Each phrase is spoken in 8 or 9 dialects from the regions of North Africa, the Levant, and the Persian Gulf. Every phrase is accompanied by a transcript.

This short video and interactive assessment activity is designed to give fourth graders an overview of analog and digital clocks.

In this Cyberchase video segment, Matt uses subtraction to help Digit figure out how much time he has left in a cooking contest with Hacker.

Correcting the time difference calculation by taking into account that there is no year 0. Created by Sal Khan.

A series of four posters showing the scale of the Universe, intended for the walls of science classrooms in secondary schools.

This activity allows pupils to learn the difference between diurnal and nocturnal animals, understand that when it is day here, it is night on the other side of the world, and that it is light when the Sun comes up and it is dark when the Sun goes down. At the end, pupils build a model of the Earth and can experiment with day and night.