Science: 2008 has been a roller-coaster ride for China and for Premier Wen Jiabao. Recent highs were the spectacular Olympics and the successful space walk late last month during the Shenzhou-7 mission, a key step toward China’s aspirations of building a space station and sending astronauts to the moon. Lows included the Tibet riot, a devastating earthquake in Sichuan Province, and the tainted milk scandal. In 2003, early in his first term as head of China’s government, Wen promoted measures …