Why do coin ridges exist on coins?

Did you notice the coin ridges on the edges of your picket change? Ever wonder why government treasuries spends so much money on creating those tiny little ridges? Wouldn’t it be easier and cheaper to build a smooth one? Of course, the Treasury might save some money to make the edges smooth. However, the U.S….

Watch How You Can Lock A Door Using Only A Dinner Fork

There’s a long-running myth about how you can lock a door with fork or two forks. It sounds like a nifty life hack. Who knows when you’ll need to lock a door to protect yourself from an ax murdered? Now, I’ve tried it myself–and I’ve never been able to work. There has to be something…

You Must Change Your Passwords Immediately

The Internet doesn’t come with a safety harness. If you are using online commerce (which is nearly everyone), there is always some risk of a security breach–and even identity theft. Now, security researchers have discovered an enormous spam list–containing over 710 million email addresses. Uncovered by Benkow, a Paris-based security researcher, this is the largest…

Mysterious Human Teeth May Rewrite Human History

There are many questions about the origins of mankind, but researchers have a pretty good idea of how it all went down. At least they thought they did, as a new discovery by archaeologists in Germany may shake our current understanding of humanity’s history that has been taught in colleges and schools for decades. A…

[DECODED] Those Mysterious Laundry Symbols

Ever wondered what those symbols on your garments mean? They’re actually standardized symbols for garment care. Here are some of the basics: There are many variations, but once you learn the basics, it’s fairly self-explanatory. It helps to keep in mind the different things that you can do to your laundry: wash, bleach, dry, iron, or…

The shorter your sleep, the shorter your life: the new sleep science

Everyone feels better after a good night’s rest. Now, neuroscientist Matthew Walker says sleep deprivation is increasing our risk of cancer, heart attack and Alzheimer’s. And he might be right. More than 20 large-scale epidemiological studies report the same clear results: the shorter your sleep, the shorter your life. For example, adults aged 45 years…

10-Cent Broken LED Renders Billion Dollar Telescope Unusable

This is such a lovely story of an engineer who knew his stuff and saved the day! The W. M. Keck Observatory is a two-telescope astronomical observatory near the summit of Mauna Kea in the U.S. state of Hawaii. The total funding to the Keck telescopes is in the billions of dollars, and it’s responsible…