Nasdaq Reaches 6000 – Stock Market Bubble Debate Remerges

Nasdaq tops 6000 for the first time

http://money.cnn.com/2017/04/25/investing/nasdaq-6000-tech-stocks/

Are US Stocks in Bubble Territory?

https://www.bloomberg.com/news/articles/2017-04-06/fed-weighs-in-again-on-stock-valuations-here-s-what-charts-show

http://finance.yahoo.com/news/robert-shiller-interprets-what-the-cape-ratio-says-about-the-market-today-102737135.html

UPDATE:
Identifying Market Peaks and Bottoms
https://www.bloomberg.com/view/articles/2017-04-27/judging-the-staying-power-of-record-markets