SMALL AND MIGHTY

Is Planet Nine a grapefruit-size black hole?

Colour blindness, or colour vision deficiency, is fairly common, affecting around 1 in 12 men and 1 in 200 women. Individuals who are unable to distinguish between different shades of red, yellow and green have what is known as red-green colour vision deficiency. Researchers at the University of California have designed glasses with lenses fitted with a filter that can increase the separation between the colours’ wavelengths. Participants who wore the glasses for two weeks were able to distinguish between different colours more easily, even after taking them off. “When I wear the glasses outside, all the colours are extremely vibrant and saturated, and I can look at trees and clearly tell that each tree has a slightly different shade of green compared to the rest,” said participant Alex Zbylut.