reporter: 30 million people around the world suffer with graeme sutherland.-- suffer with alzheimer's. this is a significant first step. mohammed: let's bring in our guests, in glasgow, graeme sutherland who uses social media to raise awareness about all timers after his mother was diagnosed. he is a social media best of all time or -- alzheimer's scotland. in the u.k. bart de strooper. and in cambridge susan kohlhaas. thank you for joining us today, susan let's start with you today. the results from this clinical trial, how big of a breakthrough is this? susan: this is a historic moment for alzheimer's research. the first time we've actually shown a drug that you give to people can slow cognitive decline. it is what we've been waiting for the field for many years. his sake -- it is a combination of research, patient effort, and people participating in clinical trials. a fantastic news for the field and shows that dementia is not an inevitable part of aging. we are delighted. mohammed: let me follow-up, you mentioned this is slowing cognitive decline. this cl