It’s time to open the “halls of memory” and get out of them a little old-new, but equally useful knowledge.“And why do you need to learn it? It won’t work in real life anyway!” Probably, in childhood, everyone at least once asked himself this question, sitting in the most boring of the lessons. But there is no useless knowledge in the world. And much of the “unnecessary” school information is very useful in adult life. For example, here are 8 school tricks that everyone should remember.
These are facts and skills many of us learned in school, but we probably forgot as soon as we left the school walls. It’s time to open the “halls of memory” and get out of them a little old-new, but equally useful knowledge.
1. How to calculate the time left until sunset
We count the hours and minutes until sunset.
When the sun is already on the horizon, raise your palm horizontally in front of your eyes. Make sure that the sun disk “touches” the index finger. Now count the number of fingers from the sun to the horizon (you can substitute the second palm from below). Each of them is approximately 15 minutes long. For example, 4 fingers between the sun and the horizon are 1 hour before sunset. A very useful scout trick that will come in handy when hiking, fishing, or when you want to surprise on a romantic date.
2. Stop guessing if this month has 30 or 31 days
Calculate the number of days in a month without a calendar.
You definitely heard about this trick in school. Both palms – into fists and start counting the knuckles. Each knuckle and each hollow is a month. We start, of course, in January. Knuckle = 31 days and hollow = 30.
3. How to multiply with your fingers
Multiplication table for 6-9, which can be “spy” on the hand
The multiplication table is still a hassle, especially when it exceeds 5. But if the failure in school knowledge persistently makes itself felt, you can always multiply the numbers from 6 to 9 on your fingers. To do this, carefully look at your hands, lowering them with your palms down. Number each finger from 6 to 10, starting with the pinky. Now, to multiply, for example, 8 by 7, connect the “eighth” finger of one hand with the “seven” of the other (as in the photo). All the fingers that ended up on the bottom and connected themselves are tens. In our case, “5”. And the fingers on top are units and their number must be multiplied by each other. In this example, it is 2 x 3 = 6. Total: 56.
4. Measure the length of small items without a ruler
Measuring without a ruler
Here, too, you can count “on the fingers.” It is enough to remember that the distance between the tips of the thumb and forefinger is approximately 18 cm, and between the thumb and little finger – is about 20. Of course, due to the “individual settings” (read, sizes) of each, the result will never be accurate to the millimeter. But at least you can guess.
5. And measure the angle without a protractor
Angles without a protractor A protractor is the second object after a compass that every third person consistently forgot to put in a briefcase and bring to geometry. But even without it, you can get out. If you remember that the angle between the thumb and little finger in the “normally spread” position = 90 degrees, between the little finger and ring finger = 30 degrees, the little finger and middle finger = 45, and the little finger and index finger = 60.
6. Check if the battery is charged
“Dead” or “alive”?
7th-grade physics test: Drop a battery from a low height while holding it vertically. Fell sideways – discharged. And if it bounced, but retained a vertical position, it will still work.
