You must have noticed this common thing in your home, office, or even shops — most ceiling fans have only three blades. While four- or five-blade fans also exist, they are less common in India. Engineers and manufacturers say there are strong scientific and...

COP30 host Brazil has created 10 new Indigenous territories, with the climate summit hit by protests in recent days.The designation means the areas, including one in part of the Amazon, will have their culture and environment protected under Brazilian law - though this is...