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Category: Science

Fast and forceful gel robots

[These] robots are made entirely of hydrogel — a tough, rubbery, nearly transparent material that’s composed mostly of water. Each robot is an assemblage of hollow, precisely designed hydrogel structures, connected to rubbery tubes. When the researchers pump water into the hydrogel robots, the structures quickly inflate in orientations that enable the bots to curl up or stretch out.

(MIT News)

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Maya empire remains

Lidar Image

Two articles about the Maya civilization:

Seeker article about LiDAR being used to reveal ancient structures on the Jungle ground: A network of 150km of prehistoric Autobahn ran through the Jungle, binding the Mayan Empire together.

“These causeways are 130 feet wide, up to 20 feet high and in some cases they extend as far as 25 miles,” Hansen said.

A causeway is a raised road across difficult, often wet or unstable ground. Because of the raised structure LiDAR can find these roads even today.

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Unlearning Descriptive Statistics

Anscombe’s Quartet by Schutz

Unlearning Descriptive Statistics explains many things you should know about working with Numbers that your Statistics Class in University probably did not explain properly.

If they did, maybe Graphite would not hurt so much, with all the Averaging going on where it shouldn’t, and maybe Gill Tene would not have had to give talks like How NOT to measure latency (which is awesome, by the way and if you haven’t seen this talk, do it right now).

From the Intro of Unlearning:

If you’ve ever used an arithmetic mean, a Pearson correlation or a standard deviation to describe a dataset, I’m writing this for you. Better numbers exist to summarize location, association and spread: numbers that are easier to interpret and that don’t act up with wonky data and outliers.

Statistics professors tend to gloss over basic descriptive statistics because they want to spend as much time as possible on margins of error and t-tests and regression. Fair enough, but the result is that it’s easier to find a machine learning expert than someone who can talk about numbers. Forget what you think you know about descriptives and let me give you a whirlwind tour of the real stuff.

Go, read the rest.

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Measles in Germany

Article in the FAZ (article in german): Two pupils attending a Gymnasium in Frankfurt got the measles. The vaccination records of 800 pupils are being checked. Youths without vaccination are being banned from attending school for safety reasons.

2016, 14 cases of measles have been registered in 2016, down from 70+ the year before. One girl died from complications (article in german), effectively killed by her parents denying her vaccination. Measles viruses can attack brain cells, and if the sickness progresses to that stage, it is always deadly.

Vaccination helps.

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Racing our galaxy

Why is our galaxy moving through space, and into which directions is everything else moving?

Scientists at the Hebrew University of Jerusalem have been mapping these forces, and found a very empty region in space that seems to push a lot of galaxies away from it, as well as a (previously known) region thats attracting them.

The result looks like a billion light year magnet:

The dipole repeller

What causes these forces is as of now not well understood.

Original Paper in Nature Astronomy.

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Time Crystals

A crystal is a regular, repeating structure of matter in space. What if we made a regular, repeating structure in time instead?

Wilczek countered that a time crystal was more akin to a superconductor, in which electrons flow with no resistance, and in theory could do so forever without the need to add energy to the system. In a time crystal, electrons would travel in a loop rather than a line and occasionally bunch up rather than flow smoothly, repeating in time the way atoms in ordinary crystals repeat in space.

Jennifer Ouelette writes in New Scientist that this is indeed not just theoretically possible, but has been done, and could be maybe useful to built better quantum computers.

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