You are given a sentence and your task is to generate another sentence that supports the given input.

Mass on a Vertical Spring When simple harmonic motion is discussed in introductory textbooks, the mass connected to the spring usually slides on a frictionless horizontal surface.
An object attached to a spring sliding on a frictionless surface is an uncomplicated type of simple harmonic oscillator.

Viral vectors are a tool commonly used by molecular biologists to deliver genetic material into cells.
A viral vector is the name for a tool commonly used by molecular biologists to place genetic material into cells.

Electron A sub-atomic particle found orbiting the nuclei of an atom.

Atomic orbitals are populated with subatomic particles known as electrons.

