4LD presentation in english

So, whatever subject you chose for your presentation:
 it has to be related with heat and temperature, so focus on energetic aspects, exange in mechanical energy and heat, temperature involved and so on
 write it in english
 between four and ten slides
 write sources (sitography)
 if you prefer you can use free online tools as http://www.prezi.com or http://sway.com
 no more than two students
 please, notify me your work in edmodo (course code 93xr8r) in the specific assignment