Rare system of five stars discovered – BBC News

Astronomers have discovered a very rare system of five connected stars.The quintuplet consists of a pair of closely linked stars – binaries – one of which has a lone companion; it is the first known system of its kind.The pair of stars orbit around a mutual centre of gravity, but are separated by more than the distance of Pluto’s orbit around the Sun.

Source: Rare system of five stars discovered – BBC News

Regression to the Mean

He illustrated the misconception by a simple exercise you may want to try yourself. He drew a circle on a blackboard and then asked the officers one by one to throw a piece of chalk at the center of the circle with their backs facing the blackboard. He then repeated the experiment and recorded each officer’s performance in the first and second trial. Naturally, those that did incredibly well in the first try tended to do worse in their second try and vice versa. The fallacy immediately became clear: the ch

Source: Regression to the Mean

How They Found the World’s Biggest Prime Number | Mental Floss UK

Recently, Dr. Curtis Cooper (well, his computer) discovered the largest prime number known to humanity. It’s more than 22 million digits long, so folks just call it “M74207281” for short.Okay, so how did Cooper do it? And why? In the video below, mathematician (and standup comedian) Matt Parker digs in. He shows how you can test the primality of a given number, plus various shortcuts that allow computers to work on absurdly large numbers like M74207281.

Source: How They Found the World’s Biggest Prime Number | Mental Floss UK

Banks, a different approach by country | Chris-Warburton.com

Last week I noticed my local HSBC branch had posted a notice to explain is was closing and relocating all customers to another branch 12 miles away.They are not the last branch in town, however it is, no doubt, disappointing nevertheless for the local businesses and customers.Whilst I understand the economics behind of the decision, and have previously written about the changes underway the banking industry, what really stuck me was a difference between the UK and Canadian market.

Source: Banks, a different approach by country | Chris-Warburton.com

5 charts that show smartphones are taking over the world – Vox

The PC business is huge. Manufacturers of conventional desktop and laptop computers sold about 300 million units in 2014. But as this chart shows, the market for smartphones and tablets is way bigger. By the end of 2014, consumers were buying 300 million Android and iOS devices per quarter. And unlike the PC business, the mobile device business is still growing.

Source: 5 charts that show smartphones are taking over the world – Vox

Eyes go red and stingy after swimming because of urine, not chlorine | Science | News | The Independent

The red, bloodshot eyes that people get after being in a swimming pool aren’t caused by chlorine, as thought — but by what happens when people urinate in the water.People weeing in the pool means the urine reacts with chlorine to create a chemical compound that hurts the eyes, according to the US’s Healthy Swimming Program. And those chemicals can also create poisonous gases that can damage lungs, hearts and nervous systems.ADVERTISINGinRead invented by Teads“That ‘chlorine’ smell at the pool isn’t actually chlorine,” said Chris Wiant, chair of the US Water Quality and Health Council. “What you smell are chemicals that form when chlorine mixes with pee, sweat and dirt from swimmers’ bodies.”

Source: Eyes go red and stingy after swimming because of urine, not chlorine | Science | News | The Independent

Thin underwater cables hold the internet. See a map of them all. – Vox

These thin underwater cables are the circulatory system of the global internet — while we get our GIFs and videos from fiber optic cables and cellphone towers, high-speed international information is transferred almost entirely under the sea.Related A map of all the underwater cables that connect the internetFor all the talk of a wireless world, fiber optic cables are still the fastest way to move large amounts of information. Even though covering the ocean floor with cables is a complex, laborious task, it’s worth it for the gains in international communication speed.It’s these cables that distribute 99 percent of international data and drive everything from high-frequency trading (around the Arctic) to a range of high-tech consumer internet services.

Source: Thin underwater cables hold the internet. See a map of them all. – Vox