Before a rainfall, we often feel rather uneasy and perspire significantly. Why is this?
Do you know about the dark spots on the Sun? These spots, which are called sunspots, are caused by interactions with the Sun’s magnetic field and are 2000°C cooler than the rest of the surface.
Have you heard of the Central American salamander Bolitoglossa dofleini who could extend its tongue more than half its body length in 7 milliseconds? 18,000 watts of power per kilogram of muscle is generated in this process, which happens 50 times faster than you can blink an eye.
The reason why tightrope walkers carry a pole is to distribute their mass far away from the center and obtain a greater moment of inertia. When the moment of inertia is high, it is harder for the system to move around the rope. So the tendency for the system (Person on the rope and the horizontal pole) to fall from the rope is decreased.
Why do tightrope walkers in circuses carry long poles while walking on ropes?
Ancient Egyptians had to pull massive statues and pyramid stones weighing several tons on large sleds across the desert in order to build the structures we see today. Ever wondered how they managed to pull them, without any modern mechanical device? The clever trick that has enabled them to do so was adding a small amount of water to sand. It’s been tested and confirmed now that by adding the right amount of dampness, water droplets bind the sand grains together and significantly reduce the sliding friction!
When we think about air pollution, we often think about the damage it does to our lungs when we breathe in the polluted air. But it’s been found out now, that some air pollutant chemicals can be absorbed into our bodies directly through the skin. So when you take a walk in a polluted urban area, wearing a filtering mask might not be enough.
Until very recent times, scientists believed that Zebras were blessed with their unique skin patterns for camouflage purposes against predators, because moving striped figures often confuse observers. But new studies have suggested that these strips help in warding off flies too! Researchers have tested this with striped surfaces that are similar to animal skins, to find out that flies stayed away from stripes as thin as those found on Zebras.
Cats have very flexible backbones which allow them to rotate themselves while falling. When the fall starts, the cat begins rotating its head, directed by its eyes and ears, until it’s facing that way. Next, its spine follows as it arches its back; then its front and hind legs get positioned for the impact with the ground.
How are cats always able to land on their feet after falling?
Ever wondered how meteors get their various colours? They are caused by light emitted from metal atoms of the meteoroid when they burn. If the meteoroid contains Sodium, it will have an orange-yellow color. Likewise Iron, Magnesium, Calcium will give colours yellow, blue-green and violet. Apart from this, molecules in the atmosphere too can have an effect on the colour.
Eutrophication is a common result of water pollution, causing environmentally harmful algal blooms to grow. A group of scientists have found a brilliant way to transform these environmentally harmful algae into low-cost, high-capacity electrodes that could be used in sodium-ion batteries.
In ant nests, Queen Ants reproduce, soldiers defend, and workers find food. But apart from these groups, scientists have discovered a new caste of foragers within ant colonies; thieves. They rob other ant colonies and take their food. When these ants are caught, the victim ants pick up the thieves and carry them off about a meter or so and let them go. After that, they again go back to thieving.
We have special receptors (TRPM8) in our tongues that sense the change in the temperature. Mint we eat contains Menthol, which binds with TRPM8. It causes signals to be generated and sent to the brain indicating that the mouth was exposed to cold. Hence, we get a cold sensation in our mouths.
Why do our mouths feel cold after eating minty foods?
Do you know why the people who pluck coconut, usually spin the coconut around its vertical axis before releasing it to the ground? This is to keep the coconut from splitting, by keeping its angular momentum constant. When the angular momentum is constant, the coconut doesn’t rotate while falling and always lands on its pointed side.
Scientists have developed an artificial leaf that can produce fuels from Carbon Dioxide and sunlight, mimicking the natural process of photosynthesis. This leaf uses a combination of semiconducting nanowires and bacteria in creating fuels such as methane and gasoline. Unfortunately you can’t yet buy it in stores, since it’s still at the experimental stage.
Did you know that most wild plants emit natural odors in order to attract enemies of the pests that damage them? This way, plants protect themselves by alerting animals when a tasty meal is available.
The honeybee has a stinger with two barbed lancets. Once they sting, they fail to pull back the stinger because humans have thick skin. Therefore, part of the honeybee’s digestive tract, muscles and nerves are left behind inside the skin. This huge damage kills the bee.
Honey bees die after they sting a person. Why is this?
The Wi-Fi technology is widely used today due to its many advantages. But now, it’s time for Wi-Fi to move over as Li-Fi takes its place. Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It is designed to use LED light bulbs similar to those currently in use in many homes and offices. So when you want to use internet, you will only have to turn on your light bulb.