Needle, knife, abacus, eyeglasses: These are my favorite tools when I think about humanity's origins and future.

FORBES: Magazine Article

The abacus and eyeglasses were as momentous for the mental world as the needle and knife were for the physical, helping us create information societies.

FORBES: Humanity's Unseen Weapons

The knife--originally knapped stone--has been the partner of the needle since the Paleolithic era.

FORBES: Magazine Article