Have you noticed the wing spoiler at the back of a racing car? It’s not just to give the vehicle a stylish sporty look but has a scientific reason. That is to ‘spoil’ unfavorable air conditions across body of a car and to increase their grip on the road. So it’s ensured that the vehicle doesn’t lose contact with the ground though accelerated to very high speeds.
You must have heard that the giraffe is the tallest animal in the planet. But did you know that a giraffe can clean its ears by its own tongue. That’s because not only their neck but also the tongue is very long extending to about 50cm.
Even though the skin can certainly turn red from the exposure to the heat of the fire, the skin will not tan. We can get a tan skin by sunlight because sunlight contain UVA and UVB rays which stimulate the darkening of existing melanin and also increase the production of melanin. This is the pigment responsible for the dark skin color. Fires on the other hand do not emit UV rays and not an effective way to get tan.
You must have heard that people take sunbathes in order to make their skin tan. Do you think it is also possible to get a tan skin by standing near fire or open flame? Explain your answer.
Ever cut an onion and started tearing up? Most people do. When you cut onions you break cells releasing their content forming sulfenic acid. They mix with the enzymes in the onion and produce a gas called Propanethiol S-oxide. This reacts with the water in our tears and forms mild acids. Acids burn stimulating our eyes to release more tears to wash the irritant away.
When travelling in an airplane all of us prefer to be in the window seat because of the clear aerial view that can be observed. But did you notice that there is a tiny hole in the bottom of the window? But why? Actually it’s a very important safety feature. It is used to regulate how much pressure from the cabin is exerted onto the window’s panes and makes sure that if the window is going to break, the outer pane goes first. This gives the pilot enough time to drop to lower altitudes if necessary.
Have you ever heard of beavers? At least you must have seen a picture of them. Oh yes we are referring to those animals who chew wood all day long. But did you know that there is a scientific reason behind this chewing? Beaver’s teeth never stop growing. If they don’t chew, their teeth can lock up their jaw or even can grow through their brain.
Even though we expect the room to be cooler that is not what will happen. Instead the room would get warmer. Generally a fridge takes air inside the fridge and cools it by removing heat from it. This heat is usually blown out the back of the fridge by a little fan.
If we leave the door open, fridge takes air from the entire room itself. So heat is merely recycled from the room into the fridge, then back into the room. But since we can’t design a fridge to be perfectly efficient part of energy supplied to the motor is converted to heat. A net room temperature increase would result from this heat of the motor that would be constantly running to move energy around in a circle.
If you leave a refrigerator open in a closed room, will it make the room cooler? If so reason out your answer.
Most of us find a travel in a train comfortable and exciting. While waiting at the railway station people usually tend to walk along the platform. If you too have done that must have experienced this! When we stand close to a fast moving train we are sucked towards it. But why? What’s the actual reason behind this attraction? When a train with high speed passes by, it drives away all the air from that area and creates a low pressure region. As a result air from our back with high pressure flows to that region pushing us towards the train.
Try to go back in your memory lane and recall an incident where you were near a blazing bonfire. What can you remember? Of course it must have been hot. Other than that did you notice your skin gradually turned red? Want to know why? Our blood vessels react to heat by dilating and creating an increase in blood flow to the affected area. As a result our hands, legs and face which are exposed to fire gets reddish.
If you are asked to choose someone for the title “killer in the ocean”, who would it be? I know what’s running in your mind. Yes this is about him, The Shark! Did you know that a shark can detect one drop of blood in a million drops of water. That’s because they have an acute sense of smell much more than humans. Cells in their olfactory epithelium are extremely sensitive and the olfactory bulb of their brain is enlarged and can detect miniscule amounts of certain chemicals. This often indicates to them that there is wounded prey they can easily overpower.
When you hear the word “beach”, what is the first thing that comes to your mind? For most of us it is a vivid picture of a sandy shore with short shrubs lying along the ground. You might have wondered why these plants have low heights and multiple stems. Want to know why? The plants grow in coastal areas should have the ability to tolerate strong winds and sandy saline soil. To reduce the damage by strong winds, these plants grow as shrubs. And also they have deeply spread root systems to help them with anchoring the shifting sand.
Have you ever experienced the difference between the same food cooked for equal time periods in a normal oven and a microwave oven? If you are a good observer you must have noticed that the food taken from the microwave oven is uniformly cooked whereas the interior of the food cooked in the conventional oven happens to be comparatively raw. Didn’t you spare even a second to think of the reason behind this difference? Conventional oven cooks food providing heat only from the outside. But in a microwave oven the waves emitted are absorbed by the particles of the food and are converted directly into atomic vibrations resulting heat. As such food is cooked more evenly and fast.
Baking and eating bread is something many people all over the world do every day. Many breads are baked using yeast. Did you know that yeast is a microscopic fungus? In a water environment, yeast use sugar and oxygen to produce a gas called carbon dioxide. The carbon dioxide makes the dough rise and creates the bubbles or air pockets that you can see in the bread that you eat.
Did you see that some spiders are shaking their webs? This is an instinctual defence mechanism for many web weavers. Against animals with poorer vision, the spider just looks like a blur and the potential attacker can’t see what is going on, and usually retreats. Not only that, they may increase the probability of trapping some insect that flies obliquely near the web, touches it but doesn’t get stuck, so perhaps moving the web will increase the likelihood of catching it.
The temperature of outer space (Cosmic Background Temperature) is about 3K and the pressure is almost zero. If we take a glass of water into outer space, it turns out that having a pressure vacuum will cause the water boil almost instantly. After that, vaporized tiny water droplets will be immediately frozen. But, after little time, whole water will be frozen if it was placed very far from sun.
If you took a glass of water into outer space, would the water freeze or would the water boil? Explain
Do frogs drink water? Frogs do not drink like we do. They absorb water directly through their skin in an area known as the ‘drinking patch’ located on their belly and the underside of their thighs. Frogs have another use of their skin. That is exchanging oxygen for carbon dioxide through their skin, but it needs to be moist for the process to work correctly. That’s why you typically see frogs near water or burrowed in damp soil.
The only two non-silvery metals in the world are gold and copper. A metal is defined as an element that readily forms positive ions (cations) and has metallic bonds. These elements have electrons that are loosely held to the atoms, and will readily transfer them. Most metals’ electrons reflect all colors equally which are in the visible spectrum of light. So those metals appear as white – silver. But, Gold and copper happen to absorb blue and violet light, leaving yellow light of the spectrum. So gold and copper are yellowish in color.
The largest “Coral Reef ” of the world, which can be observed even from the space, known as the ” Great Barrier Reef ” have already faced a daunting risk. Age of this Great Barrier Reef is about 25 million years. Unfortunately It has been faced three major bleaching events during the last 18 years because of human activities. In this year, the reef has died almost a quarter of it, due to the bleaching. However, Scientists still say, it is not totally died yet. Now, lot of actions currently being implemented by authorities to conserve them.