1. Martin Cooper's invention
became famous immediately.
was very expensive.
was heavy and took a long time to charge.
2. Robert Cornelius
took a picture of his family.
worked with Louis Daguerre to make the first camera.
sat still for a long time for the first selfie.
3. The first YouTube video and Instagram photo both involved
food.
animals.
family members.
4. Tim Berners-Lee and Jack Dorsey
invented the same piece of technology at the same time.
included messages about their new invention when they first
both used mobile phones to develop a new product.
