PostsCommentsPayoutsdhingrapranay15 (28)in #knowledge • 7 years agohow an automatic fire alarm worksThe automatic fire alarm system uses the fact that different solids expand by different amounts on heating . The alarm…dhingrapranay15 (28)in #life • 7 years agofidget spinnerhi guys , so There’s a new, dumb trend: the fidget spinner. It’s a toy like a top, but spin in the hand rather than on…