suggestions on Mechanical seminar topics

Electrowetting cells
Micro V Belts
Liquid zoom lenses
Solar powered UAV's
Self Lubricating linear guideways
Hybrid tapered roller spindle
Hydroplanning
Direct shift gearbox (DSG)
Energy-absorbing bumpers
Radar Guns
Liquid Hydrogen as an Aviation Fuel
green engine
ceramic Inserts
Pneumatic forming
Air Suspension system
Water jet cutting technology