Full memory weighs more than empty memory

In 2011, a few years into the brand-new e-reader craze, The New York Times weighed in on a common claim: unlike with a backpack, you can fill a digital device up with books and see no change in weight. To find out whether this was true, they turned to UC Berkeley computer science professor John D. Kubiatowicz. His answer? False.
​When you get down to its most basic structure, digital data is just a series of ones and zeroes, each known as a ”

bit”. A Kindle, like most mobile devices and many modern laptops, stores that data on flash memory. This type of memory puts each bit on a transistor, which distinguishes between a one and a zero using trapped electrons. The more data, the more electrons are trapped. (It’s important to note that the number of electrons doesn’t change with more data, just the number of trapped electrons.) 
Still, a trapped electron is in a higher energy state than an untrapped electron, and since Einstein’s famous equation E = mc^2 (didn’t think an article about the Kindle would invoke Einstein, did you?) says that energy equals mass, a flash drive full of electrons in a higher energy state will be heavier. Of course, the difference is almost laughable: 10-18 grams, according to Dr. Kubiatowicz. That’s a hundred-millionth as much as the difference between a full and dead battery, and because the most sensitive scales can only sense a difference of 10-9 grams, the extra heft is effectively unmeasurable. 
Even still, it is a difference. When you pack your e-reader (or iPad, or smartphone, or laptop) full of files, you’re ever so slightly weighing it down. Learn more about how digital memory works in the videos below.


Iron man in reality

For many of us walking, running, playing,jumping and working without anyones help, is just a normal task which we can do without thinking but some of our friends just dream of walking and doing all other activities which we can do without thinking.

A large number of companies are working hard to refine robotics exoskeleton that can do everything. In full body design or worn from the lower back or waist down,

therapeutic exoskeletons use tiny motors attached to orthotics to help people who usually get around in wheelchairs. The ability to stand and move around also helps them prevent muscle atrophy, build strength and boost circulation.

Wearable robots aren’t new< DARPA has been funding their development since 2000s with aim of enhancing soldier’s strenght and endurance. Panasonic, Ekso Bionics and others are also spreading alot on the developlment.

Theropeutic exoskeleton are found mainly in hospitals and rehab centers.

So far, only a handful of companies around the world have regulatory approval to sell exoskeletrons for home use.

The exoskeleton made by some of the companies are very effective but they are too heavy to carry and put pressure on the lower part of the body. 

So far those wont turn you into real life superhero.Engineers have made efforts to crteate a super strong full body exoskeleton.

The stronger the suit is the more power it will consume and this requires a bigger battery and make the suit heavier.That is what exoskeletons like Lockheed Martin and Ekso Bionics’ HULC(Human Universal Load Carrier) and Sarcos/Rayutheon’s XOS2 have encoutered.

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