Monthly Archives: April 2021

When disease-causing germs enter the body (which acts as a “host” to the germs), the immune system of the host launches a defence to destroy the germs and protect the host from the disease. In immunology, the invading germs, which can be bacteria, viruses, parasites or fungi are known as antigens. An antigen is thusContinue reading “What are vaccines? How do they work?”

Why does the sky appear blue? What is the reason for the spectacular red hues observed during sunrise and sunset? And what makes the ocean blue? These are some of the questions people ask whenever they observe the beauty of a magical sunset or gaze into the blue expanse of the ocean. What is theContinue reading “Colours of the Sky and the Sea”

A darkly mysterious world lies below the surface of the sea. It is estimated that more than 60% of the Earth’s surface is covered by ocean water more than a mile deep. The deep sea is the single largest habitat on earth and is widely unexplored. In fact, it is speculated that more is knownContinue reading “Life in the Deep Sea”