Since most people are right-handed, many tools are made for right-handed people. This can make everyday life difficult (and sometimes dangerous) for lefties. For example, most scissors are designed to be used with the right hand. If you are right-handed and try to use scissors with your left hand, you'll probably have a very hard time cutting anything with them. This is a type of annoyance that lefties face every day. Most lefties become quite flexible in using both of their hands because of years of practice using objects that were designed for right-handers.