Group 1 - The article discusses Norbert Lou's investment portfolio, highlighting it as one of the best among super investors [1] - PayPal (PYPL) is mentioned as a significant part of the discussion regarding investment opportunities [1] Group 2 - The author of the article is a mechanical engineer with a B.S. in Mechanical Engineering and an M.B.A. in Finance, indicating a strong educational background in both engineering and finance [1] - The author employs evidence and factor-based investing strategies in their personal portfolio, occasionally speculating on individual stocks believed to be undervalued [1]