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Which direction was the camera pointing at while taking this picture?

North

South

East

West

The entire celestial sphere seems to rotate slowly around the North-South axis of Earth's rotation. So the camera must have been pointed North or South, depending on the hemisphere the photo was taken at. But the brightest star in the centre must be Polaris, at the south celestial pole currently lacks a bright star to mark its position.

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Why were photographic prints sepia toned?

sepia process was cheaper than black and white

for improved resistance

it is simply ageing of paper

it is the effect of exposition to sunlight

World's fastest high-speed cameras were built to take photos of specific objects. What kind of objects?

rocket launches

nuclear bomb explosions

Why do cats have vertical pupils?

to have sharper vision

to better see in the dark

to be more attractive

it is a useless mutation

What photographic technique was used to create this photo?

phototypography

painting on the lens