HS-PS4-5

Communicate technical information about how some technological devices use the principles of wave behavior and wave interactions with matter to transmit and capture information and energy.

  1. Physics

    World’s coolest ‘clock’ is also crazy-accurate

    This is the time to beat — the world’s most accurate atomic clock ever. At its heart is a ‘fountain’ of cesium atoms chilled nearly to absolute zero!

    By Janet Raloff
  2. Space

    How the outer sun gets so hot

    Magnetic waves boost the corona to extreme temperatures.

    By Stephen Ornes
  3. Tech

    Cell phones on the brain

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

    By Stephen Ornes
  4. Tech

    Electronic paper turns a page

    Changeable ink and battery-powered paper may make textbooks lighter and bring video newspapers into daily use.

    By Emily Sohn
  5. Tech

    Cell phones and possible health hazards

    Radiation from some cell phones appears to kill brain cells in rats.

    By Emily Sohn