Chak Ek', the morning star, rose from the underworld to the surface of the eastern sea and on into the heavens. His brother K'in Ahaw, the sun, followed. Though Chak Ek' had risen first, K'in Ahaw outshone him, and the resentful Chak Ek'...

In this video Paul Andersen explains how simple harmonic motion occurs when a restoring force returns an object toward equilibrium. The two types of harmonic motion studied in AP Physics are the mass spring oscillator and the simple...

Mr. Andersen describes the major groups on the periodic table.

From 2016 to 2019, the world saw record-breaking heat waves, rampant wildfires, and the longest run of category 5 tropical cyclones on record. The number of extreme weather events has been increasing for the last 40 years, and current...

New ReviewIn this video, I will show you how to graph trigonometric functions, specifically focusing on cosecant (csc) and sine. We will examine how to identify key characteristics such as amplitude and period to effectively graph these functions....

New ReviewIn this video, I'll walk you through graphing cosecant functions by first focusing on the reciprocal sine graph. We'll explore the process for y=csc(2x) by understanding its relationship to y=sin(2x), covering key elements like amplitude...

New ReviewIn this video we are going to review the types of problems of trigonometry that you can expect to see on your precalculus semester 1 midterm exam

New ReviewIn this video, I'll walk you through three essential tips to help you graph sine and cosine functions effectively. We focus on understanding the core components like amplitude and period, which are crucial for accurately plotting these...

New ReviewIn this video, I'll walk you through how to graph cosecant functions, especially when they include a phase shift. We'll cover the amplitude and period to accurately graph the cosecant graph by first understanding its related sine...

Sigh. Nutrition research is often bad, and how we talk about it is even worse. If you believe the hype from the past several years, intermittent fasting doesn’t only help you lose weight, it may go so far as to prolong your life. So what...

In this video Bill Thisdell examines the period known as Personal Rule, when Charles I governed without Parliament. How revolutionary was this practice? Why was personal rule a problem? Part of our English Civil War series of videos.

India's Launch Vehicle Mark-3 (LVM3) launched the CMS-03 spacecraft, also known as GSAT-7R, from Satish Dhawan Space Centre.



"The LVM3 deployed the 9,700-pound (4,400-kilogram) CMS-03 into geostationary transfer orbit about...

This video is the seventh installment of our Psychology Revision Series to prepare you for your exams with exactly the right information that you need to know.

One thing we’ve heard from many of you is that this show is your sleep show, that soothing bit of media you put on when you need to slow down your brain and drift off. We take that as a huge compliment. It’s nice to know we can be a...

Although myth indicates that Japan was founded in 660 BCE by Emperor Jimmu, the first clear records concerning Japan are provided by the Chinese almost one thousand years later, in the third century CE. Since its beginnings, Japan has...

Despite popular perception that Saudi Arabia is a desert, the country actually has three climatic zones. There is a harsh, arid desert across most of the country. There is an area of steppe along the western highland region. There is...

In this video, we explore the four types of sentences and practice identifying them along with using the correct punctuation mark at the end—a crucial step in building strong writing skills for students of all ages. We cover...

What happens when a satellite slows down in orbit? Learn how a small Δv transforms a circular path into an elliptical orbit, with step-by-step analysis of orbital energy, period, and arrival timing.

A satellite in elliptical orbit speeds up as it approaches the planet—thanks to angular momentum conservation. Learn how to calculate angular speed at perihelion using Kepler’s laws and orbital geometry.

The goal of the GCF Reading Program is to help adults at all levels become more proficient readers.



Utilizing various learning tools, learners will be able to learn and practice reading the top 1,000 most frequently used...

There are a lot of misconceptions about tariffs, and some really good reasons why we don't use them like a hammer anymore.

Who wouldn't want to make money doing nothing? Passive income is possible, but there are some mighty thick strings attached.

A complete sentence has a capital letter, a subject and a verb, punctuation, and is a complete thought. Fragments and run-on sentences are two sentences that are not complete.

A video explaining detente in the Cold War.