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dhingrapranay15 (28)in #knowledge • 8 years ago
how an automatic fire alarm works
The automatic fire alarm system uses the fact that different solids expand by different amounts on heating . The alarm contains two metal stripes , one of iron and the other of…
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dhingrapranay15 (28)in #life • 8 years ago
fidget spinner
hi 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 a surface. The user holds a pad at the center, and flicks…
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