1. Why does a candle not produce smoke when burning, but lots of smoke when you blow it out?
There are two parts of a candle: the wax and the wick. The wick is the thread-like thing that sticks out and which we light with a match. The wax is the fuel that burns producing light through the capillary action of the wick. When the candle is burning, we do not see smoke coming out of it. When we blow it out, what we see is not smoke but vaporized paraffin wax that was acting as fuel.
2. Why do men lose weight faster than women?
The reason why men lose weight faster than women is because men are physiologically built to burn fat faster. They have a higher metabolic rate and more lean muscle mass that consumes more calories. Since men have a higher metabolic rate, they need to consume more calories.
3. Why do our fingernails grow faster than our toenails?
Our fingernails grow two to three times faster than our toenails. There are a lot of similarities between our fingernails and toenails. Both have a distal matrix from where new nails grow. The distal matrix has epithelial cells that die over time and leave behind the protein keratin. The slower growth of toenails is that lesser blood blow reaches the feet than the hands resulting in lesser oxygen and nutrients for the growth of new cells in the toenails’ distal matrix.
4. Why does standing in one place make your legs sorer than walking?
Walking doesn’t make our leg muscles as sore as it would when we are just standing. Our legs do not get a break, as none of them are off ground for even a second when we are standing, but when we walk, the legs get a quick break alternatively. Standing still can hinder the heart from pumping blood efficiently. This is one reason why our feet swell after long periods of standing. While we walk, the muscles contract which helps the heart to pump blood.
5. Why does it seem like we look better in the mirror than we do in a photograph?
The photographs we see are actually flipped, mirror images of ourselves. We are used to seeing ourselves in the mirror, and so our snapshots don’t seem to look right. This has a lot do with the fact that most human faces are not symmetrical, one eye or ear might be slightly bigger than the other, or we may have a mark or mole on our faces. When you see a photograph, you expect a certain image of you that stems from the memory of your face in the mirror.
- Why is the foam of a shampoo always white irrespective of the shampoo’s color?
The pigments in the shampoo become so thin when mixed with water that the visible light gets scattered. The light rays get reflected in several directions after striking a surface much like how the sky appears white or gray at times. The dye that is used in coloring shampoo is highly diluted, which means that when further diluted with water, the color becomes much lighter.
7. Why don’t we recognize own voice in a recording?
When we hear other people talk, the sound waves travel through the air and vibrate our eardrums. The same happens when we hear our own voice in addition to one more thing. Our vocal cords vibrate when we speak, and these vibrations are a second source of sound for us. So, when we speak what we hear is a combination of these two sounds.