Have you ever gone to a doctor with a problem and not been believed? Or had your symptoms downplayed? Medical misdiagnosis, or 'gaslighting' can have life-threatening consequences, and disproportionately happens to marginalised people. Learn how to spot it and get a second opinion. Plus, could animals that can count hold the key to understanding our own mathematical mastery? Cognitive neuroscientist Dr Brian Butterworth shares how the animal kingdom's numerical skills can help us treat human learning disorders.