Many scientists have studied left-handedness. The majority of humans are right-handed. This means that most people use their right hand for everyday tasks. These tasks may include writing, throwing, or using scissors Scientists do not know what makes peoplie right- or left-handed. Some think it is a result of genetics. Others believe that social pressures determine handedness. Some scientists think that it is a combination of several factors Do it! Scientists study what left-handedness A damages B improves C causes D hides