There are some topics about which it seems no amount of data will change people's minds: things like climate change, or restrictions on gun ownership. Neuroscientist Tali Sharot says that's actually for good reason. As a general rule, she says, it's better to stick to your beliefs and disregard new information that contradicts them. But this also means it's very difficult to change false beliefs. This week, we look at how we process information, and why it's so hard to change our views.