- Why is the tail of the wing curved so oddly?

this pointed part is called winglets - gliding wings, which help reduce swirling air and increase lift for the aircraft.
- New discovery: Dragonfly wings can kill bacteria without antibiotics

scientists have discovered yet another amazing ability of dragonflies that people need to learn. it is the ability to kill natural bacteria on dragonfly wings.
- Wingless animals that can fly like birds

what animal has no wings but can fly? this article will summarize for you the flying animals so that when asked what animal has no wings but can fly, you can answer right away!
- What is the difference between the scissor keyboard and the butterfly wings?

while apple's laptops are considered the pinnacle of design, users have (and are still) struggling to type in things that don't work. and the reason for this is the butterfly keys.
- Close the door when turning on the air conditioner, everyone thinks it's right, turns out the mistake is not good for health

closing the room door when turning on the air conditioner is a habit of many people because they think it helps save electricity. however, this is not good for everyone's health.
- Size of paper size A0, A1, A2, A3, A4 ... how many mm, inch?

below is the size of a paper size (both mm and inch) in accordance with iso 216, which was introduced by the german standards institute in 2012.
- Size of paper size A0 A1 A2 A3 A4 is how many Pixel, Cm, Inches standard

many people wonder about the size of paper sizes a0, a1, a2, a3, a4, a5, ... in cm, pixel or inch units. the following article, please refer to this section to better understand this issue.
- How to open the car door properly and safely

opening the car door seemed to be an obvious, very simple job. however, if opened incorrectly and not observed, it sometimes leads to unnecessary accidents.
- Decode the image of a bird that doesn't flap its wings, but still floats in the air

a video capturing the image, the bird without flapping its wings but still floating in midair was cut from a cctv (security camera) in front of a controversial social network apartment. what strange thing is going on here?
- Science explains the cause of the phenomenon that has just left the door to forget what to do that many people have

most of us have ever encountered a situation of leaving the door or going from one room to another without remembering where we were going, what to do. is this a warning sign of some disease such as dementia?