Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials.

  1. Tech

    Cell phones on the brain

    When an active cell phone is pressed against the ear, the brain gets busier.

  2. Environment

    Underwater racket

    The oceans are getting louder, and scientists want to know what that means for marine residents.

  3. Physics

    Explainer: What is a laser?

    Lasers are the brightest source of light on Earth and produce the purest form of color possible.

  4. Physics

    Explainer: How a synchrotron works

    Giant magnets direct superfast light into beams up to 30 million times as bright as those produced by a laser pointer.