We use analog and digital signals in our everyday lives with the radio, the cell phone and with our own computers. our computers and our cell phones are all digital now but radio's are still considered analog. Radio telescopes explore space by using radio waves and signals to almost like scan space and collect data like a sonar in a submarine.
If you find something embarrassing, its more likely that other people with also think its embarrassing. All the other points are on the internet right now. Amazon sells things, News show information and there are political campaigns to show you there offers
