Explosives can be used for better or worse. Fireworks, for example, are great entertainment and celebration especially for the 4th of July. Although others, such as bombs and grenades, are very harmful to people. Weapons like guns and knives can be used for better or worse. Hunting may be your hobby and you use both weapons, so they are useful in helping us provide food. They can also be harmful especially to those who don't know how to use them properly or to people who think that using these weapons on other people will take away their anger or solve their problems.