This week, everyone gets a chance to say '520' to science

From new underwater drones to preserved roses that have helped lift villagers out of poverty, China's newest technologies and their applications were showcased at the launch of the 17th National Science Week on Saturday in Beijing.

China also will open more than 3,000 universities and scientific facilities during the week for free tours. More than 500,000 visitors are expected to attend the 116 facilities founded by the Chinese Academy of Sciences alone, the academy said on Saturday.

"This year's theme is building a strong nation with science and fulfilling dreams with innovations," Vice-Premier Liu Yandong said at the Cultural Palace of Nationalities in Beijing, where some exhibitions are being held.