60 Minutes 2/2

<p>Frontotemporal dementia -- or FTD -- is the most common and most devastating forms for dementia. As Bill Whitaker tells us, the cause of the illness, which effects many Americans under the age of 60, remains unclear.&nbsp;With Arctic permafrost thawing too quickly, scientists in Siberia are considering drastic measures. Scott Pelley reports. John Green, the best-selling author of books like "The Fault in Our Stars," opens up to Jon Wertheim about exploring his fears through his writing.&nbsp;</p><p>See Privacy Policy at <a href="https://art19.com/privacy" rel="noopener noreferrer" target="_blank">https://art19.com/privacy</a> and California Privacy Notice at <a href="https://art19.com/privacy#do-not-sell-my-info" rel="noopener noreferrer" target="_blank">https://art19.com/privacy#do-not-sell-my-info</a>.</p>