One teacher was particularly keen to introduce colour and pictures into maths textbooks: he felt this would make them more accessible to pupils brought up in a cartoon culture.
Ask a psychopath what he is supposed to do in a particular situation, and he can usually give you what non-psychopaths would regard as the correct answer.
Psychopaths can't connect emotionally. Researchers have thought that trait may be connected with an outsized drive for reward and an inability to register fearful expressions in others' faces.
Some think that people from Peru made the Moai thousands of years ago. Others think that aliens from space made the Moai and left them as some kind of message.
The researchers think that they can attach the sensors to cardboard boxes, and then supermarkets can scan the sensors with a portable device to see how ripe the fruit inside is.