I watch this today and exciting to hear that kilogram is refined based on Plank's Constant. The fundamental problem is all of our mass measurements is based on one metal tube witch is hold in Paris for centuries; But by the 2018 all standard is redefine. Standard Mass Veritasium Video:
Writing on GNU/* & Bi-Di (Most Complex Unicode Algorithm Ever Possible!!! ㇱㇱ) Also Physics!