Well, you've got to choose the items you wish to keep as a memory of our time very carefully. It's a historical record - that usually means a piece of writing or a narrative of events at a particular time. Well, let's discuss time capsules and vocabulary related to memory. But first, a question to test your knowledge of time capsules. The International Time Capsule Society is based at Oglethorpe University in Atlanta, in the US, and it studies these artefacts. According to this organisation, how many time capsules are estimated to exist in the world today? Is it: