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Slavery predates written records and has existed in many cultures . [3] The number of slaves today is higher than at any point in history , [4] remaining as high as 12 million [5] to 27 million, [6][7][8] though this is probably the smallest proportion of the world's population in history. [

Coherer, iron and mercury: In 1899, the Bengali physicist Jagdish Chandra Bose announced the development of an "iron-mercury-iron coherer with telephone detector" in a paper presented at the Royal Society, London.[19] He also later received U.S. Patent 755,840, "Detector for electrical disturbances" (1904), for a specific electromagnetic receiver. Cotton gin, single-roller: The Ajanta caves of India yield evidence of a single roller cotton gin in use by the 5th century.[20] This cotton gin was used in India until innovations were made in form of foot powered gins.[21] The cotton gin was invented in India as a mechanical device known as charkhi, more technically the "wooden-worm-worked roller". This mechanical device was, in some parts of India, driven by water power.[4] Crescograph: The crescograph, a device for measuring growth in plants, was invented in the early 20th century by the Bengali scientist Jagadish Chandra Bose.[22][

Simputer: The Simputer (acronym for "simple, inexpensive and multilingual people's computer") is a self-contained, open hardware handheld computer, designed for use in environments where computing devices such as personal computers are deemed inappropriate. It was developed in 1999 by 7 scientists of the Indian Institute of Science, Bangalore, led by Dr. Swami Manohar in collaboration with Encore India, a company based in Bangalore.[69][70] Originally envisaged to bring internet to the masses of India, the Simputer and its derivatives are today widely utilized by governments of several Indian states as part of their e-governance drive, the Indian Army, as well as by other public and private organizations.[71][72] Snakes and ladders: Snakes and ladders originated in India as a game based on morality.[73] During British rule of India, this game made its way to England, and was eventually introduced in the United States of America by game-pioneer Milton Bradley in 1943.[73] Stepwell: Earliest clear evidence of the origins of the stepwell is found in the Indus Valley Civilization's archaeological site at Mohenjodaro in Pakistan.[74] The three features of stepwells in the subcontinent are evident from one particular site, abandoned by 2500 BCE, which combines a bathing pool, steps leading down to water, and figures of some religious importance into one structure.[74] The early centuries immediately before the common era saw the Buddhists and the Jains of India adapt the stepwells into their architecture.[74] Both the wells and the form of ritual bathing reached other parts of the world with Buddhism.[74] Rock-cut step wells in the subcontinent date from 200-400 CE.[75] Subsequently the wells at Dhank (550-625 CE) and stepped ponds at Bhinmal (850-950 CE) were constructed.[75] Stupa: The origin of the stupa can be traced to 3rd century BCE India.[76] It was used as a commemorative monument associated with storing sacred relics.[76] The stupa architecture was adopted in Southeast and East Asia, where it evolved into the pagoda, a Buddhist monument used for enshrining sacred relics.[76] Toe stirrup: The earliest known manifestation of the stirrup, which was a toe loop that held the big toe was used in India in as early as 500 BCE[77] or perhaps by 200 BCE according to other sources.[78][79] This ancient stirrup consisted of a looped rope for the big toe which was at the bottom of a saddle made of fibre or leather.[79] Such a configuration made it suitable for the warm climate of most of India where people used to ride horses barefoot.[79] A pair of megalithic double bent iron bars with curvature at each end, excavated in Junapani in the central Indian state of Madhya Pradesh have been regarded as stirrups although they could as well be something else.[80] Buddhist carvings in the temples of Sanchi, Mathura and the Bhaja caves dating back between the 1st and 2nd century BCE figure horsemen riding with elaborate saddles with feet slipped under girths.[81][82][83] Sir John Marshall described the Sanchi relief as "the earliest example by some five centuries of the use of stirrups in any part of the world".[83] In the 1st century CE horse riders in northern India, where winters are sometimes long and cold, were recorded to have their booted feet attached to hooked stirrups.[78] However the form, the conception of the primitive Indian stirrup spread west and east, gradually evolving into the stirrup of today.http://en.wikipe