Entrain Schedules Light Exposure to download the app and start using it

iOS: Research shows that light exposure is a major factor in your body's rhythms, so mathematicians have built an iPhone app called Entrain that cuts jet lag time and gets your body adjusted to a new time zone faster.

Developed by researchers at the University of Michigan, Entrain is a guide that takes user input to give you a schedule that promises to overcome jet lag faster. It doesn't use light sensors or any other automatic input, so it's important that the user submits data—it's not magic!

The science behind the app is that light is the primary diving input to the body's circadian rhythms, so if you feed Entrain your current light input schedule, it can figure out light stimulus that moves your body clock from one phase to another. Detailed math is available in a paper at PLOS:

These schedules are mathematically proven to adjust you to new time zones as quickly as possible. Light is the primary driving input to the circadian clock, and by recording your lighting history, we can simulate your body's clock and make recommendations for behavior.

So the first step in using the app is to schedule your current time zone, and when you are reaching a new time zone. The next step is the important one: choose the brightest light you can be in during your trip. This is what Entrain uses to figure out a schedule for you that will get your circadian rhythm in line with your new surroundings. From then on, it's a matter of telling the app the light you are currently getting in your scheduling and following the recommendations, which update as you add input.

While it's a great app, for a short visit, it might not be worth the trouble of avoiding jet lag. And if you don't have an iPhone, there's an Android version on the way, but for now, you will have to rely on other ways to cheat jet lag like acting by your destination's time zone while flying.

The official website of Entrain linked below has more details about the app and the science, but if that's not for you, feel free to download the app and start using it.

Entrain (Free) | iTunes App Store via Entrain

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Drop tests, static electricity, dust exposure & more – how Samsung tests the Galaxy S5

You’ve heard about automotive crash testing and crash tests for motorcycle helmets. Samsung, too goes through great lengths to ensure its flagship Galaxy S5 can stand up to its claims of water- and dust-resistance, as well as mandated radiation-related safety standards.

Throw in radiation meters, static electricity, five-foot drops and repetitive button pressing into the mix and you have some extreme durability testing!

Here are some of the devices and methodologies that Samsung uses at its testing facility in Korea to ensure its design is up to spec. Don’t forget to check out the crash-test dummy.

Radiation testing. No matter how research claims that mobile phones don’t emit enough radiation to cause cancers and other disorders at the cellular-level, fact is that these devices do emit radiation through radio waves. For mobile phones, this is measured through the specific absorption rate (SAR) defined by the FCC and other regulatory agencies. Samsung uses a mix of foam-coated walls and ceilings, antennae and liquids that mimic the human body, in order to determine how much radiation its devices give off.

The foam in this room absorbs waves from the S5. Samsung uses this setup to mimic an open-air environment and test the device’s radio.

Durability tests. The Galaxy S5 is marketed as a water- and dust-resistant device, which should help ward against damage from spills and exposure to dusty environments.

Samsung uses this device to expose the S5 to dust particles. Engineers then try to determine how well the device handles dust.

Samsung also uses a device for dropping the phone from various heights and positions, using high-speed cameras to determine points of potential stress and damage. That’s definitely more scientific than the drop tests we do!

This device drops the S5 from various heights. The entire thing is captured by high speed cameras, helping Samsung determine potential break points when the phone is dropped.

Samsung also tests for static electricity (featured image above), which can fry the electronics inside a device when your hands have all those extra electrons from physical activity. And if you’re curious about that home button? Yes, Sammy also presses it thousands of times to see if it will give out.

Samsung uses this device to repeatedly press the device’s physical and capacitive buttons to test for wear and tear.

Sensor tests. Now what’s a phone without great audio? And what’s a smartphone without a decent camera? Samsung also tests the S5 for audio quality, particularly the speaker volume, microphone sensitivity, and how well these perform when set against a human face.

Samsung audio engineers test the S5′s speaker quality and mic sensitivity with different simulated noise settings.

What’s interesting is that engineers fine-tune the S5 differently depending on the intended market. For example, models meant for European markets have different volume and audio sensitivity compared with those meant for Asian markets, taking into account the expected noise levels in these scenarios.

Of course, these scenarios are done in controlled environments, which means the real-world might result in different levels of stress. Still, you can hand it to Samsung for its due diligence. While you probably won’t immerse your smartphone in a bag of flour, it’s probably going to get a few dust particles and pocket lint wedged into in-between spaces due to regular use.

Interested in learning more about the Galaxy S5? Here’s our review and first thoughts. Do you think Samsung’s controlled testing is extreme enough, or is there no match for real-world testing when it comes to a device you carry around in your pocket all day?

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