Twins - they're so magical, aren't they? Nothing can ever come between them, they speak a language of their own. Maybe you've dreamt of one day having twins or maybe you've wondered if you're even prone to having them. It turns out that factors like age, weight, height, body shape, and allergies all play a role in how likely you are to have twins. Take this quiz and find out whether or not your next pregnancy will be a 2 for 1!