First up, they’re not facts. The problem of course is that we experience them as if they are. Consider the case of the tarantula and its reportedly deadly venomous bite. According to Dave Clarke, head of invertebrates at London Zoo in the UK. "Most spiders can sense the heat from our bodies and will avoid us," says Clarke. "They are not naturally very aggressive." Even if they do use venom, it's rarely lethal. "The venom is used to subdue their prey," says Clarke. "None of th