1. You can know the degree of an angle by hand only.
Open your fingers as much as possible and place your palms on the surface of the angle you want to measure. The little finger should be at the bottom, representing 0°. The angle between the thumb and the little finger is 90°, and the angle between the little finger and the other fingers is 30 °, 45 ° and 60 °, respectively.
2. You can use the hand knuckles to find the number of days per month.
Clench your fist and start a few knuckles. Each joint bump and gap is a separate month. Start with one hand, then, after reaching the end, start again with the knuckles of the index finger. If the month is at the joint bump, there are 31 days, and if it is in the gap, the month contains 30 days or less.
3. When you are 60 years old, you will lose half of the taste buds and the ability to distinguish between sweet, salty, sour and bitter products.
You have 9000 taste buds born to work with your sense of smell, because your taste depends mainly on the smell. As you age, your sense of smell and taste change. Between the ages of 40 and 50, the number of taste buds decreased and the rest began to shrink. After the age of 60, you may begin to lose the ability to discern the taste of sweet, salty, sour and bitter foods. The sense of smell did not begin to subside until the age of 70; its decline exacerbated the loss of the taste of the affected people
4. When you fall asleep, you can’t smell anything.
Although sound will destroy sleep, smell can’t. According to a new study by Brown University, people cannot rely on the sense of smell to awaken their fire.
5. Hole between the camera and the flash on the iPhone
When you use a rear camera to make a video, it’s a microphone for recording sound.
Picture from: zhejiushideguo (weibo); jinxuanhui, emoji Island