Here's why one expert says scorching-hot tech stocks are far less vulnerable than they were during the dot-com bubble — and why they can keep climbing

· *Tech stocks' rally from mid-March lows is fueling concerns of another market bubble, but history shows the shares are fairly valued, James Paulsen, chief investment strategist at The Leuthold Group, said. *
· *Though tech companies now comprise roughly 27% of the S&P 500's market cap, their sales contribute to a greater...