Additional online reading Welcome to BFSU: › Forums › Volume One › Learning Progression “C”: Physical Science, Engineering and Technogy › Lesson C-2. Sound, Vibrations, and Energy › Additional online reading Tagged: Enhancement This topic has 0 replies, 1 voice, and was last updated 10 years, 1 month ago by Bernard Nebel. Viewing 0 reply threads Author Posts November 8, 2014 at 7:31 am #375 Bernard NebelKeymaster How bats see at night (Griffin’s discovery of bats’ use of echolocation) http://www.highlightskids.com/audio-story/how-bats-see-night Author Posts Viewing 0 reply threads You must be logged in to reply to this topic.