Questions with the keyword 'invention'

• Who invented the radio telescope and when (what year) ? Also have you seen anything fascinating through the telescope by Charlotte to Anna Comments: (No comments so far )
• If you could create a reactive metal what would it be and how would it react? by Mich to Anna, George, Jodi, Rob, Stefan Comments: (No comments so far )
• When were phones invented? by Needham88 to Rob Comments: (No comments so far )