Early Japanese ninja weapons discovered including stone precursor to the throwing star

Archaeologists in Japan have uncovered what may be early Japanese ninja weapons including rocks that may have led to the metal throwing stars beloved by Hollywood and pre-teens. Uncovered during excavations at Iwatsuki Castle and Hachioji Castle, the flat 'throwing stones' and clay caltrops may date back to the Siege of Odawara in 1590. — Read the rest