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Previously, I used to use an iPhone app to measure/track quality of sleep. In order to measure the sleep, put iPhone on my bed and taking sleep, then, if my body moves on the bed, the iPhone detects the vibration and recognize it as shallow sleep(REM sleep or light sleep). If there is no vibration, it means deep sleep (Non-REM sleep). But, such app is hard to use it. Users need to launch the app before sleep We cannot know when we fall asleep Vibration strength is depending on the bed. The app may not detect correct shallow sleep. I ...

Nowadays, Virtual currencies values are getting high dramatically. Although Bitcoin's value has also been risen, other currencies are risen. Especially, Ripple(XPR) value has became about 40 - 50 times in this year. I googled blogs about this matter, some investor got more than 40 million dollars by XPR's value increase. I am envy of them. My bitcoin value became about 10 times. I bought the coin in Feb. 2015. From a conclusion, My bitcoin became 10 times, but I did not become a rich man. Because I have only a few bitcoin. Why did I buy bitcoin? In 2015, a ...