Beam search: is a heuristic search algorithm that is an optimization of best-first search that reduces its memory requirement. Beam stack search: integrates backtracking with beam search. Best-first search: traverses a graph in the order of likely importance using a priority queue. Bidirectional search: find the shortest path from an initial vertex to a goal vertex in a directed graph. Bloom filter: a constant time and memory check to see whether a given element exists in a set.
Estimates vary as to how long it took to build the Taj Mahal. Some historians state that it took only 14 years to build it, from 1631-1645, but a more realistic figure is probably 22 years, being completed in 1653.
Cambridge, Massachusetts: Harvard University Press. The Taj Mahal The crowning jewel of Indo-Islamic architecture, the Taj Mahal is one of the worlds most beautiful and beloved structures. The monument was built in Agra, India, for Mumtaz Mahal, the favorite wife of Mughal emperor Shah Jahan. Construction of the tomb began in 1632 and employed more than 20,000 laborers for 20 years.