Dow Jones futures rose modestly Tuesday morning while S&P 500 futures fell slightly and Nasdaq futures tumbled, after coronavirus vaccine news triggered a wild, uneven stock market rally Monday. The Dow Jones and S&P 500 index jumped to a record high after Pfizer
) and BioNTech
) jointly announced that their Covid-19 vaccine candidate was more than 90% effective. But the Dow and S&P closed well off highs while the Nasdaq reversed significantly lower.