Discover and read the best of Twitter Threads about #siredefinition
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Hi tweeps! Remember back in March, I made a mega-thread of amazing #WomenInSTEM that you should follow, especially for #IWD2018? If not, here's the 'moment' I made from it twitter.com/i/moments/9718…
Well, today (19 Nov) is #InternationalMensDay #IMD2018, and I wanted to mark the occasion. So here are SIXTY men working in STEM who also happen to be some of my favourite tweeps. This is by no means an exhaustive list - please don't be offended if you're not on it!
PS: I have some actual (paid) work to do today, so I'll update the list when I can, in between all my other commitments. Please be patient 😊
Important day for SI nerds, the meeting to formally redefine the kilogram, the kelvin, the ampere and the mole is happening today! Watch a livestream of the vote here: bipm.org/en/the-si/
If the resolution is approved, the SI will be based on fundamental physical constants, instead of physical objects. Timetable and resolutions being decided today is available here: For the first time bipm.org/utils/en/pdf/C… 
Why is #SIredefinition happening? Because physical objects can change over time. By fixing the kilogram in terms of the Planck constant, it can never change. There's a good explainer all about it by @B_resnick here: vox.com/science-and-he…
Today is #SIRedefinition day. Read up on why this has come about in the Commentary by Joachim Fischer & Joachim Ullrich rdcu.be/bbusO
Dedicated readers will also known that for the past few years we've been running a dedicated column on metrology, Measure for Measure: nature.com/articles/nphys…
(you can go down our metrological memory lane here: nature.com/nphys/articles…)
