antiproton

"There will be a charge of five dollars."

"Can you see any tracks in the snow?"

"The after-school program is a great way for kids to continue learning. "

"The science teacher conducted an experiment to demonstrate how plants grow in different types of soil. "

"I have a house and a car."

"He aimed at the target, but the arrow flew straight over it."

"The teacher's negative on the project proposal meant we had to revise it completely. "

"The detective carefully examined the fingerprints to detect the thief. "

"When a body collides with another, then momentum is conserved."

"We had to sit in the dark because the electric was cut off."

"When a high-energy collision creates an electron, it almost always creates its corresponding antiparticle, a positron, at the same time. "

"The hydrogen atom has only one proton in its nucleus. "