ADD TO MAIN TIMELINE:
function formatDate(d){
	var date = new Date(d);
	var months = Array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
	var dateString = months[date.getMonth()] + " " + date.getDate() + " " + date.getFullYear()
	return dateString;
}

function truncString(s, n) {
	var ts = (s.length > n) ? s.substr(0,n-1)+'...' : s;
	return ts;
}



MODIFY ITEM CLICK FUNCTION:
root.detailRenderer.title.text = truncString(feedItems[e.currentTarget.id].title, 35);
root.detailRenderer.date.text = formatDate(feedItems[e.currentTarget.id].date);
root.detailRenderer.description.text = truncString(feedItems[e.currentTarget.id].description, 300);

REPLACE:
root.detailRenderer.link.on("click", function(e){
    window.open(feedItems[e.currentTarget.id].link, "_blank");
});

WITH:
root.detailRenderer.link.url = feedItems[e.currentTarget.id].link;
root.detailRenderer.link.on("click", function(e){
    window.open(e.currentTarget.url, "_blank");
});