X-Rays, which are now used on a day to day basis for diagnosis in medicine, was discovered by?
Who invented the Band-aid?
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Who invented the mobile phone?
Who invented the bifocal glasses?
Physical Research Laboratory was founded by ____.
The first gasoline-run car engine was developed 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