Question

who discovered metro rail and who discovered laugh and who discovered traffic signals and who discovered ⛽petroleum and who discovered Rice for the first time :-) ans fastly please..........

Answer 1

Metro rail was discovered by George Stephenson
Traffic signals were discovered by Garrett Morgan and J.P knight.
Petroleum was discovered by Edwin L. Drake.
Laughter was discovered by Joseph Priestley.
Rice was discovered first in china.

hope it helps!!!

Answer 2

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Fulgence Bienvenue discovered metro rail.

Charley Douglass discovered laugh.

Garrett Morgan, J. P. Knight and William Potts discovered traffic signals.

Edwin Drake's discovered petroleum.

Rice was discovered first in China.