![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/1088009/spectrum_asn91a.jpg)
Very high frequency spectrum and the spectrum
Mathilde Hertz (understood the raven)
Gustav Hertz (Mathilde's uncle, won a Nobel Prize)
Carl Hertz (Mathilde's cousin, helped invent inkjet printing and the sonogram)
Heinrich Hertz (proved the spectrum--Mathilde's dad)
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/1088009/Annual_TV_Sales_39-59_nvvug8.jpg)
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/1088009/RVAE378_VIOLEN_G_20110923205707_qz0qqi.jpg)
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/1088009/maxresdefault_eahbbf.jpg)