What a clever way to visualise the shrinkage of glaciers around the world. The white in each nation's flag represents the size of glaciers at three points in time. Go to the website for more flags. Source: https://t.co/KxjX9XHOmnpic.twitter.com/V9QrGLk0Jv
On Jupiter, there is no clear boundary between the atmosphere and the liquid interior of the planet. Likewise, there is no sudden boundary as the atmosphere ends and the vacuum of space begins. A gas giant is a continuum between nothingness and density. pic.twitter.com/xUgVmoehxV
Maddow: Don't get this thing. Do whatever you can to keep from getting it.
Rachel Maddow reveals that her partner, Susan, tested positive for Covid-19 and is still recovering, and implores viewers to consider their loved ones when they calculate their own Covid-19 risk. pic.twitter.com/oUz2DBLG63
Colouring Penrose-deBruijn tiles based on their shape and orientation can look very nice (I have an applet that does that: https://t.co/I3iY3hbE2D), but I only recently learned that they can always be 3-coloured, as shown by Sibley & Wagon 20 years ago:https://t.co/Fjw7fyTvHrpic.twitter.com/DIYorKdhzd