The Hubble Space Telescope . A) is remote-controlled
B) is a space observatory
C) orbits Earth
D) has changed scientists’ thinking about the universe
E) all of the above
F) none of the above

Which of the following activities would conserve the most energy? installing a dimmer switch on a light using a blender instead of a food processor hanging clothes to dry on a clothesline instead of ironing them opening a window instead of turning on the air conditioning setting your computer's screen saver to turn on after less time has elapsed