STOCKS AT ALL-TIME HIGHS: Here's what you need to know

Stocks showed signs of life on Thursday.
Major indices hit all-time highs over the course of the day, with the Dow ticking up over 18,600, the S&P 500 touching 2,187.66, and the Nasdaq hitting 5,238.54 in intra-day trading.
This is the first time all three indices closed at all-time highs since New Year's Eve on December 31, 1999, according to a tweet by Bespoke Investment Group.
Still, this was the 21st day in a row that the S&P 500 moved less than 1% in either direction.
Let's hea