Questions with the keyword 'invention'

• have you ever invented anything if so what by anon-217556 and 1 other. to Harrison, Savannah, Philippe, Lucy, Joanna, Edoardo Comments: (No comments so far )
• which is the most biggest invention in the world by anon-217583 to Savannah, Philippe, Lucy, Joanna, Harrison, Edoardo Comments: (No comments so far )