I think loudspeakers are pretty impressive. Who’d have thought that waving a paper cone around in just the right way could produce the same effect as blowing a French horn?
(Or just show them magnets—how do they work?)
I think loudspeakers are pretty impressive. Who’d have thought that waving a paper cone around in just the right way could produce the same effect as blowing a French horn?
(Or just show them magnets—how do they work?)