We have all heard the saying that men are more intelligent than women. Some researchers have reported that men's IQ are a little higher than women, but this claim is controversial and it raises many questions. Most researchers have not been able to replicate this finding leading researchers to conclude that there are no average differences between IQ of the opposite genders. Studies have shown that men have more variable in there IQ score meaning that there are more men distributed with and low scores than women. What researchers do know is that environmental and genetic reasoning play a role in intelligence. The intelligence of women does entail having the ability to succeed more on verbal tasks like spelling then men, mathematical calculations, and being able to sense and recognize a person's feelings. Men on the other hand tend to do better and have more success on spatial ability like matching rotated blocks together. They also tend do better on math problems that require intricate answers. A possible explanation for men's spatial intelligence is that they have more prenatal testosterone than women, but this finding has not been replicated by all researchers. Researchers have told men and women to use spatial imagery to solve some math problems and they were able to conclude that the differences in their math performance were smaller when they both used the same technique.