This also relates to the loss of weight [1] of the "125-year-old platinum-and-iridium cylinder" defining the kilogram. [1] https://news.ycombinator.com/item?id

This also relates to the loss of weight [1] of the "125-year-old platinum-and-iridium cylinder" defining the kilogram. [1] https://news.ycombinator.com/item?id=6617039 https://news.ycombinator.com/item?id=6617039