gravitation

"The child was too weak to move the boulder."

"one of the fundamentals of linear algebra"

"Dust particles floated in the sunbeam coming through the window. "

"He does not even possess a working telephone."

"The teacher used a special gauge to measure how much each student had learned. "

"The seamstress used a sturdy between to create a precise, even stitch on the thick upholstery fabric. "

"Scientists are searching for the graviton, a particle they believe is responsible for gravity, like how photons are responsible for light. "

"Powerful telescopes look far back into the distant reaches of the Universe."

"The attraction of a good teacher to their students is often strong. "

"Simple: "Life exists on Earth." Slightly more specific, but still easy to understand: "My old school still exists, even though it's been remodeled." "

"the force of an appeal, an argument, or a contract"

"the force of an appeal, an argument, or a contract"