India, May 25 -- The temple priest is concentratedly washing the temple's checkered marble floor early this morning. The water flowing from his plastic hose has most likely come from Yamuna ji, the sacred river that runs through Delhi and supplies much of the city's water. The same Yamuna ji, further downstream along its course, flows past the Taj Mahal before merging with the great Ganga ji at the Sangam in Allahabad, now called Prayagraj. One imagines Ganga ji to have countless temples devoted to her. Yet they are difficult to find, at least in Delhi. One temple stands here in Old Delhi, beside Gali Mira Wali Khurd, near Chawri Bazar. Despite its rarity, the temple remains little known, perhaps because it is so small that most passers-by ...