We often hear or read that ‘some species of a bird or animal is going extinct’, or ‘a new species of an amphibian or reptile was discovered in the jungles of the Western Ghats’. However, what exactly do we mean by ‘species’?

Water Hyacinth (Eichhornia crassipes) is a free-floating perennial aquatic plant, native to the Amazon basin in South America. The beautiful, large, purple flowers make it a favourite ornamental plant. However, its beauty is only surface deep, since it has a bad reputation of being one of the worst aquatic weeds in the world.

Physics lessons in school taught us that light is electromagnetic radiation, where electric and magnetic fields oscillate in harmony and travel perpendicular to one another. Over centuries, the properties of light have led to the greatest discoveries—from far-away galaxies to understanding the structure of atoms. What if we put the light rays to do some mechanical work? That’s what optical tweezers—scientific instruments used to manipulate microscopic objects—do!

Do you remember poking a plant that quickly closed its leaves, seemed to droop and shy away? An introvert among plants and a favourite among all of us, the touch-me-not or chuimui in Hindi, is aptly named Mimosa pudica by scientists, where pudica is Latin for shy or chaste. We have all enjoyed seeing it fall asleep; probably wondering what happened inside the plant and perhaps waiting with curiosity for it to reopen!