It’s not a $245,000 wrist-orrery like this one, but it’ll do.

**Time in Tens**

Today I learned: During the 18th and 19th centuries there were passionate efforts to institute decimal time, a day divided into 10 hours, each consisting of 100 minutes, which would be further divided into 100 decimal seconds.

Just like gunpowder, paper money, and countless other things, decimal time was developed long ago in China, as far back as 2,000 years ago, only to be eliminated in the 1600’s by those pesky European Jesuit missionaries and the oh-so-logical dozenal (12-based) time system that we all know and love.

The French Revolution saw the most recent push for decimal time, with democratic reformers insisting on a base-10 calendar, and even manufacturing base-10/base-12 combo clocks like the one above (*via Wikipedia*). As recently as 1893, smart guy extraordinaire Henry Poincaré was pushing for a standard decimal time. But since so much of the world, from maritime navigation to daily appointment-keeping, had been built on the time that we still use today (and since making everyone buy a new clock is just mean), decimal time never caught on.

Nice to know that the U.S. and its failure to adopt the metric system isn’t the only decimal failure in modern history!

Mathematical knowledge is unlike any other knowledge. Its truths are objective, necessary and timeless.

**Edward Frenkel**, author of the fantastic

*Love and Math: The Heart of a Hidden Reality*, considers whether the universe is a simulation. (via explore-blog)

## Happy Valentine’s Day!

I would have gotten you a card/flowers/candy, but this is so much better.

Just copy/paste this into a Google search: **sqrt(cos(x))cos(300x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5**

**One, Two, Eleven, Twelve:** I drew up one of my favorite math tricks, which works in numerals Arabic and Roman, as well as in letters. Neat!

Originally seen on the Numberplay blog.

**The Infinite Hotel Paradox** - One of the best math thought experiments ever devised, by Jeff Dekofsky for TED-Ed.

Luckily, I made an infinite reservation, so I should be just fine.

After the last, here’s some more great math art from Mike Naylor. From the top:

- A star counting 0-444 in base 5
- A staircase counting 0-333 in base 4
- Fractal squares representing the binary numbers 0 to 127 (0 to 1111111)

If this is your thing, I’ve featured more math art in the past. Check out these mathematical tapestries from Albuquerque-based artist Donna Loraine Contractor.

**"Melt Into You"**

Two bodies, fractally intertwined, eventually dissolving into one. That’s some beautifully poetic mathematical art, courtesy of Mike Naylor.

These boards are so pretty.

I would have no heart to erase them.

Totally forgot to carry the 2 there, pal.

(via visualizingmath)

Source: magictransistor.com

Series of posters created for the love of math, nature, art, and education.

Prints available: http://meganemoore.storenvy.com/

If only there were one for reticulated splines, the set would be complete!

Source: cultivatevision