1. You may have noticed the page numbers in books: the page on the left side is always even, and the page on the right side is always odd, no matter what kind of book it is. If you don't believe it, just flip through one.\2. If you want to know whether you are being stalked, there are several methods to confirm: \(1) Stand in front of a shop window and observe the person who makes you suspicious. \(2) Has he/she stopped nearby or directly behind you? Try moving a few steps to the side; if he/she moves with you, then you are very likely being followed. \(3) Suddenly stop and turn around. Does anyone quickly lift a newspaper? If so, that person is very likely following you. \(4) When approaching a corner, suddenly run; if someone runs with you, then you are definitely being stalked.\3. Following the above, if someone is following you and you want to get rid of him/her, there are several methods: \(1) Blend into a large crowd. \(2) Run into a small street, enter the first building, and quietly wait behind the door. \(3) Do you have reversible clothing? If so, you can go into a shop, turn the clothing inside out, and then walk out with many people. \(4) Enter a building and inquire about where the back door is. If you encounter a friend, exchange coats with him. \(5) In the dark, you can place a lit flashlight on the side of the road to look as if you are holding it, and then quickly sneak off in the opposite direction.\4. People may not pay much attention, but horse riders cannot mount from the right side; otherwise, it indicates that they do not know how to ride.\5. This trick is very practical; to confirm whether someone has entered your room, there are several methods: \(1) If the door opens outwards, after locking it, you can place a crumpled paper ball by the door. Note that the paper ball should not be too big or conspicuous; it should look like it accidentally fell from your pocket. Upon returning, if you see the paper ball has moved, it means someone opened the door (of course, you should exclude the possibility of children playing and kicking it). \(2) You can also, when leaving the room, place a few strands of hair between the door and the frame. If the door is opened, the hair will subtly fall to the ground unnoticed.6. Friends who keep diaries, pay attention to this: how can you know if someone has been peeking at your diary:
(1) You can put a little jam on a particular page of your diary, then turn the previous page over to stick them together. Anyone who peeks at your diary will definitely separate the pages again.
(2) You can draw a thin line with a pencil along the edge of your diary (draw it horizontally, and make sure the line continues to the table as well). If someone takes a look at your diary, the alignment of the line on the edge and the line on the table will not match.
7. How to sneak out of a house without being noticed? Here are a few methods:
(1) Hold the doorknob with both hands and then turn it.
(2) When walking on wooden stairs, step on the outer side of the stairs so that the wood doesn't make noise.
(3) When going upstairs, it's best to use all four limbs. If someone suddenly comes up, you can quickly lie low and not be seen.
PS: Be careful not to be betrayed by your own shadow.
8. When entering a dark place from a very bright room, your eyes might not adjust to the darkness. You can close your eyes for a few seconds, and then your eyes will adapt to the dark environment.
9. When walking in a forest, if you feel someone is following you, you should stand still and listen quietly. Are there sounds of breaking branches? Are the leaves rustling? Are there footsteps? Are birds suddenly flying away, or do animals suddenly escape?
10. The best places to hide objects:
(1) In a soup pot. Have you observed what happens when hot soup cools down? If the pot has a lot of fat, a thick layer of grease will form on the surface. You can hide things in it.
(2) At the bottom of a drawer. Open a drawer in a cabinet or desk. Most drawers have a recessed space at the bottom. The space is small but ideal for hiding items, such as drawings. Secure it with a piece of strong tape, and even if someone opens the drawer, they won't notice.
(3) In a picture frame. Most frames have a back cover that can be opened. The space between the photo and the back cover is an ideal hiding place.
(4) In a book. Find an old book you no longer want to read. The book should not be too thin, with about thirty pages at the front and back. Cut out a square hole in the middle of the book with a small knife. Scissors are better, but be very careful. You can hide things there.(5) Hide in places where others would not expect. Some people have hidden diamonds in a decayed tooth, while others have put them in chewing gum, even while chewing it. (6) Hide inside a ballpoint pen. Take an opaque pen, cut the refill short, and seal one end with tape to prevent the ink from leaking. Secure the refill inside the pen with tape so that the pen can be used as usual without arousing suspicion. The hollow part of the pen can be used to hide items, such as letters. (7) Hide inside a chewing gum wrapper. Remove a piece of gum from a pack, carefully take out the wrapper, and wrap the paper item with tin foil. Place this special 'gum' back into the pack. If you want to transfer a secret letter, hand a piece of 'gum' to your fellow detective. Note: Always keep the gum containing the secret letter at the top of the pack to avoid mistakes. (11 items added in the reasoning challenge—The Weird Forest) 12. If you see a woman claiming to be an archaeologist wearing nail polish, you can be sure she is lying. Real archaeologists would not wear nail polish. 13. If your friend says he went on vacation to the UK and shows a photo in which the vehicles drive on the right side, this indicates the photo wasn't taken in the UK, because vehicles in the UK drive on the left. 14. How to identify a fake painting? Usually, oil paintings are stretched on wooden frames. Forgers often make the mistake of using new nails, which would not have existed two hundred years ago, immediately revealing the forgery. Besides, oil paint takes a very long time to dry, sometimes even 50 years. Usually, areas on fake paintings where the paint is applied too thickly cannot dry completely. 15. If you want to hear sounds near your door at any time, you can hang a string with a bell on the door. Even if the door opens just a small crack, the bell will ring. You can also attach two empty tin cans to the string; when the door moves, they will clang and jingle. 16. Place some tiny beads on your room's materials or books. If you find the beads missing when you return, it means someone has tampered with your materials or books.. A method for creating a password using a keyboard. Stick pieces of paper on certain keys of a keyboard and write other letters on them. For example, stick a piece of paper with the letter B on the U key. This way, when you press B, the letter that comes out is U.
. If you want to calculate the depth of a well or a valley, you can throw a stone into the valley. Multiply the number of seconds it takes for the stone to hit the ground by itself and then by 5—that will be the depth of the valley. (That is, depth = seconds × seconds × 5)
Example: A stone falls from a valley, taking 3 seconds to hit the ground. Question: How deep is the valley?
Answer: Because depth = seconds × seconds × 5
So depth = 3 × 3 × 5 = 45 meters
The valley is 45 meters deep.
. Suppose you find a person collapsed beside a railway and want to quickly determine whether they jumped down by themselves or were pushed. There is a very simple method: most people taking the train carry luggage. Whether they jumped down themselves or were pushed, the luggage would be dropped. First, quickly locate the luggage. If the luggage is beside the injured person, it is very likely they jumped down themselves. If it is not nearby, but further away, then they were certainly pushed by someone else. (Reason: if the person jumped down themselves, they would have brought their own luggage, so the luggage would be nearby. If they were pushed, the luggage (or person) would be dropped first, followed by the person (or luggage).)
