Village Blacksmith ppt
https://docs.google.com/presentation/d/189y1NH7RNQjWzNHDl-B-Muz0XjktWQop/edit?usp=drivesdk&ouid=104515738065583106118&rtpof=true&sd=true
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Climate change ppt for introducing a chapter
https://docs.google.com/presentation/d/17RQWGSc2k2p_2EIUAD2feUjb6YPVRjmX/edit?usp=drivesdk&ouid=104515738065583106118&rtpof=true&sd=true
