An autograph is the signature of a famous person, usually made out to someone who admires them. Some people collect autographs, and they can be valuable, especially after the famous person has died.
Chaff is the husks and stalks that are leftover when freshly harvested grain is threshed. Chaff can be used as a fuel or animal bedding.
Giraffes are the tallest land animals. They can grow up to 5.5 metres tall, and live for around 20-25 years. They have a black tongue that is around 18 inches long that they can use to strip leaves from trees.
This glass of water is half-full (some people would say half-empty). If you took two half-glasses of water and poured them together, you would get a full glass. A half is what you get when you cut something into two equal sized pieces.
People laugh as a reaction to something funny, or when they are tickled. Laughing is normally something you do when you are very happy.
People use a camera to turn something you can see into a photograph. A photograph is a picture of one tiny moment in time. People like to take photos of their family and pretty things that they see.