 <em>Pointed Knife</em>, ca. 4400-3100 B.C.E. Brownish-gray chert, 1 x 5 9/16 in. (2.5 x 14.2 cm). Brooklyn Museum, Charles Edwin Wilbour Fund, 07.447.844. Creative Commons-BY (Photo: , CUR.07.447.800_.801_.802_.804_.806_.807_.808_.822_.830_.840_.843_.844_.855_.865_.866_.929_.934_.941_.953_09.889.145_bw.jpg)