Understanding the water vascular system (WVS) in early fossil echinoderms is critical to elucidating the evolution of this system in extant forms. Here we present the first report of the internal morphology of the water vascular system of a stem ophiuroid. The radial canals are internal to the arm, but protected dorsally by a plate separate to the ambulacrals. The canals zig-zag with no evidenc...

For the first time in history, majority of humankind now reside an urban environment, with that figure expected to reach two thirds by 2050 [...]

In the past few years, virtual worlds – such as Second Life, World of Warcraft and RuneScape – have demonstrated the potential to be a promising online business model. Millions of paying users around the world now participate in virtual worlds and trade virtual items with each other. However, little empirical research has been conducted into players’ purchase behaviour in virtual worlds. To add...