India, May 6 -- -A stamp features Sarla Maheshwari, a Doordarshan newscaster who anchored the telecast of the 1982 Asian Games in Delhi. Why is this telecast notable as a technological milestone?

-In 1985, the postal authority of this country dedicated two stamps honouring a pair of "eastern and western" entities measuring 138 ft and 125 ft in height. A few years later, the government collapsed. What entities were the stamps commemorating, which do not exist anymore but recently are in the process of being restored?

-Thermochromic ink is a special type of ink that has the property of changing colour as the temperature varies. In June 2017, to mark a certain event, the US Postal Service released a stamp with thermochromic ink, where by p...