Global stocks markets mostly rose on Tuesday thanks to a rebound in tech shares, although investors remained concerned by China's lacklustre economy and the outlook for US interest rates."Global stock indices got a helping hand from general technology stock optimism as Nvidia's share price briefly rallied to a new all-time record high, up over 18 percent from last week's low," said market analyst Axel Rudolph at online trading platform IG. Despite Nvidia stock falling back, shares in other big t