A LEGO apparatus to demonstrate the definition of mass based on the new SI

They are cheating :-)<p>The laser and sensor aren&#x27;t standard Lego parts. Still impressive.

Is HN allowing duplicate submissions now? I don&#x27;t see a difference in the URLs for this and [1].<p>I am glad this is getting some attention. One of the authors is a former coworker of mine and told me about it a couple weeks ago.<p>[1] <a href="https://news.ycombinator.com/item?id=8724655" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=8724655</a>

<i>The acrylic cases are backlit with blue LEDs...</i><p>This is just adorable. Now I feel less guilty about putting up LED lit fans in my computer.

someday I&#x27;m going to build a nuclear reactor out of legos just for the buzz

What is this &quot;new SI&quot; ? New to the US, Liberia and Birma perhaps..