Subject 046M, two years old, was seated nervously across from me at the table, his hands clasped tightly together in his lap. He appeared to have caught an incurable case of the squirms. I resisted ...

A series of color swatches are laid in front of you – each swatch a different color. A researcher asks you which one is red, and you pick the one you believe is red. You then repeat the name game for ...

The human eye can physically perceive millions of colours. But we don’t all recognise these colours in the same way. Some people can’t see differences in colours – so called colour blindness – due to ...

A Buddhist hangs colourful lanterns in preparation for the birthday of Buddha. Photo by Getty Images/Chung Sung-Jun. If someone describes something as being all the colours of the rainbow, it means it ...