Tech Q&A: Why some photos are missing from e-mails or websites

Some website photos download more slowly than others, and sometimes you have to wait for them. Why? Website operators long ago learned not to let consumers download all the photos on a website at once. — 123rf.com

Q: I'm sending you an e-mail that I received from an online retailer. It contains some product pictures and some question marks where product pictures should be. This also happens with other e-mails and websites that I view. I'm using the Google Chrome browser, a MacBook Air laptop and Comcast Internet service. What's wrong?

— Jane Zimmermann, Maple Grove, Minn.