Though the old serif logo had a "scholarly" feel which correlates with the purpose of a search engine. That said, I think the new sans serif logo is much better because it is more modern/forward looking which better encompasses Google's wide breadth (maps, chrome, mail, docs, etc).
She started a business selling juice and marmalade as a teenager and went on to become a pioneer in micro lending. Now Esther Afua Ocloo, the Ghanaian entrepreneur is being featured on the Google Doodle on what would have been her 98th birthday. After a successful career in business, Ms Ocloo became the first black person to earn a cooking diploma from the Good Housekeeping Institute in London.