This video explores what scientists mean when they talk about the edge of the observable universe. Using real observations and established physics, it explains why space appears black beyond a certain ...

It encompasses everything that ever was and ever will be. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The universe is literally everything, ...

Assessing student learning effectively is often complicated by relying on ambiguous proxies such as grades, quiz scores, or assumptions about students' internal states, such as what they feel, think, ...