Unless they are radioactive and can give you superpowers, nobody wants spiders in their home. They have black eyes and creepy legs, leave their webs where we can walk into them, and if movies and television are to be believed, they will eat us if given half a chance. While there are very few spider species that can cause you harm, there are still a couple of dangerous species to watch out for.  Despite the fact that you could find spiders every day if you looked for them, no other species are necessarily dangerous. There are some varieties that are good for your garden, however. They set traps for other insects and prevent them from causing damage. Despite this, you certainly don’t want them crawling around your house.