Robert hooke, a famous 17th century english scientist, published a book of sketches such as the one above. what recent invention made these observations possible? telescope graduated cylinder microscope calipers

The american public did not truly take in the horror of adolf hitler's regime until years after the existence of concentration camps was first reported in american newspapers. partly this was the fault of the media, which did not give prominent placement to news of the holocaust. what other factors do you think contributed to the long delay in understanding the holocaust?