Facts
10 Amazing Indian Discoveries & Inventions
Ruler
Made of ivory, the most seasoned ruler was found in the Indus Valley human advancement and date back to the year 1500 BC. The developments of the decimal framework are shockingly precise. One such example was even aligned to 1/16 of an inch — under 2 millimeters. These sorts of rulers were plainly exceptionally noticeable, as even blocks of the valley’s structures were found to follow similar estimations.