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What is a virus?
Viruses are these tiny, invisible structures that cause infections. They make us sick. There are millions of viruses in our environment but only about 5000 have been identified by scientists. The ones you may have heard of are the Human Immunodeficiency Virus or HIV and the Novel Coronavirus or Covid-19. What do viruses look like? Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) illustration, created at the Centers for Disease Control and Prevention (CDC) Do you think that a virus is some creepy, crawly thing?...
Why are Human Voices Different?
Imagine a scenario. A criminal is being tried in court. He denies saying something. The prosecution brings a recording, saying they have his confession on tape. As the accused vigorously denies the voice being his, an expert shows just why the voice could be no one else’s. A fictional scene? Perhaps, but it is a reality that no two persons in the world have exactly the same voices. Do you know why this is so?...
Makar Sankranti
The colourful kite-flying festival of Makar Sankranti or Uttarayan, which falls on January 14 each year, marks the end of a long winter and the return of the sun to the northern hemisphere. Hence the name Uttarayan. According to Hindu astronomy, it is on this holiest day in the Hindu calendar, that the sun enters the zodiac of Makara or Capricorn, heralding the northern journey of the sun. The day is also of special significance, because on this day, the day and night are of equal hours....
Gurpurab – the birth of Guru Nanak
The Birthday of Guru Nanak, the founder of Sikhism, is traditionally celebrated on Kartik Puranmashi, or the full moon day of the month of Kartik. According to the Shiromani Gurudwara Parbandhak Committee (SGPC), Guru Nanak Sahib was born on 15th April, 1469 at Rai-Bhoi-di Talwandi in the present district of Shekhupura, now Nanakana Sahib in Pakistan. Since the birthday falls on the full moon day of the month Kartik, that is the day that Sikhs all over the world celebrate the birth of their first guru....
Why do Doctors Examine the Pulse?
If you place the first three fingers of your hand on the inside of your wrist, a dull throbbing reverberates through your hand. Da-dub, da-dub, da-dub. Very reassuring, these gentle thuds, that remind us that our bodies are kicking along, and that, at least at last touch, we’re alive and well. By pulse we mean the regular throbbing of arteries caused by the successive contractions of the heart. During the action of the heart there is a pause....
What is Cloud Seeding?
There was a time when a farmer would sit out in his field, watching a lonesome cloud float away, taking with it the last hope of a much-needed burst of rain. As humans take control over more and more natural processes – not necessarily for the betterment of civilisation – rain too seems to have finally been leashed in. Just like a farmer throws seeds on ploughed land to harvest plants, clouds can also be seeded with chemicals to induce rain!...
Which Insects Live the Longest?
Take a look around. Which insects do you see? A fly sitting on your computer screen, a mosquito buzzing in your ear just as you drop off to sleep, a butterfly flitting about in the garden outside, or how about the ants that made off with the remains of a dead moth? Most of the insects we see around us have rather short lives. A few hours, a few days, that’s about how long most insects last....
R.K. Narayan
Nearly 70 years ago, India’s greatest living writer in English, took out a brand new exercise book and wrote in it: “It was Monday morning.” With those four words, Rasipuram Krishnaswamy Narayan (just R.K. Narayan to most) took off on a journey to that oddly populated fictional continent called Malgudi, with the young boy Swami and his eclectic mix of friends. “The very first line I wrote was ‘It was Monday morning.’ And then I had an idea of a railway station, a very small railway station, a wayside station....
Why do some Rivers Flow Underground
From ancient times, people have settled down along the banks of rivers, since they provide water to drink, to irrigate their fields, and to use as waterways to go from one place to another. But hidden away, below the earth, are rivers that we rarely see, until they surface near the sea, or when they merge with another river. Some have names and are talked of with a sense of mystery, but many are nameless streams that flow through the nooks and crannies of the earth....
What is Physiotherapy?
If you’ve ever been laid up in bed because of a broken leg, or with an arm in a cast, you’ll know how limp that limb feels when it is finally out of bandages. That’s because the muscles in that particular part of the body have not been used for so long that they’ve ‘forgotten’ how to function. They need to be re-taught their work, and this is where physiotherapy comes in. Physiotherapy is that branch of medicine, which makes use of physical agents or exercises to treat a disease or an injury....
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