Why can’t I find the joke I made in the e-book of the BBK video learning machine?

1. There are many files in the e-book, you can read each one. 2. Broadband connection (or dial-up connection) and search again on the Internet. 3. This doesn’t have to be so troublesome: if there is something you want to check in the history, just click the downward arrow and you can see it. If the history record is cleared by you, you have no choice but to stop and check again.

I hope my answer is helpful to you, thank you!