Find the G.C.F. & L.C.M. of 20 and 28.
Who invented the mobile phone?
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Who invented the bifocal glasses?
Physical Research Laboratory was founded by ____.
The first gasoline-run car engine was developed by
X-Rays, which are now used on a day to day basis for diagnosis in medicine, was discovered by?
Which dynasty had its capital at Chittorgarh?
Who discovered radioactivity?
The first large scale electrical air conditioning was invented and used in 1902 by
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