3 ms·

I always get a kick out of this: https://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Prototype_mass_drifts.jpg/399px-Prototype_mass_drifts.jpg https://up

• hsod 9y ago
  context?
  • msimpson 9y ago
    It's how the mass of the International Prototype Kilogram and its copies have drifted over time: http://www.bipm.org/en/bipm/mass/ipk/ http://www.bipm.org/en/bipm/mass/ipk/ (verifications tab)
• pscarey 9y ago
  It seems you've found the source of the obesity crisis!