Agile Web Development with Rails 7:[page 34]

The code for the Playtime exercise uses a mixture of “<%=” and “<%” tags for starting the embedded Ruby sections. There is a difference and if you mix these up things don’t work. But it is easy to do so, particularly if you are new to Rails.

Maybe describe the difference, or at least point it out, since this is the first time this occurs in this book. Otherwise you will get frustrated people with difficult to spot syntax errors.