cell walls allow plants to have rigid structures as varied as wood trunks and supple leaves; and vacuoles allow plant cells to change size. What Is the Origin of Chloroplasts? Like mitochondria ...

A recent archaeological discovery in Shandong province, China, has pushed back the start date of the construction of the Great Wall by 300 years. The excavation, which took place between May and ...

The newly unearthed ruins in the Changqing district of Jinan, East China's Shandong Province, reveal that the earliest known sections of the Great Wall date back to the late Western Zhou Dynasty ...