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amount amplified animals astronomers atoms attraction of gravity audio-frequency bacteria battery blood body boil bones brain breathe burn called carbon dioxide carried carrier wave causes chemical element chlorophyll cloud coal cold color contains crystal earth elec electric current electrons energy ether waves explosion Fahrenheit faster fibres filament fire formed germs glands glass grey matter grow hair happens heat inch inside iron keep kind last answer layer light liquid living cells living matter magnet merely messages metal miles millions molecules moon move muscles nerve cells ocean ordinary oxygen particles pass plants plate pressure probably produce R. S. Lull radio waves radium rain revolve rocks salt scientists believe shine skin sometimes sound stars stream substance sugar sunlight surface temperature things tiny tissues tricity trons unconscious unconscious mind usually vacuum tube vibrations weight wire yeast