Original sentence: " The curated data makes Alpha different from semantic search engines, which index a large number of answers and then try to match the question to one.According to their FAQ, the site "use[s] a portfolio of automated and manual methods, including statistics, visualization, source cross-checking, and expert review
Edited sentence: The curated data makes Alpha different from semantic search engines, which index a large number of answers and then try to match the question to one.The data from Wolfram Alpha is curated by Wolfram Research employees