Questions with the keyword 'machine'

• What knid of technology would we need to make hovering machines by sirjohnheart to Cathal, Daphne, Darren, Jon, Katherine Comments: (No comments so far )
• have you made any machines that could provide power using green power by sirjohnheart to Cathal, Daphne, Darren, Jon, Katherine Comments: (No comments so far )