21.   One reader asked about composting in a large plastic bag.

22.   On a related topic, other readers have asked if using two firewalls makes sense.

23.   Readers frequently ask about the best orientations at unfamiliar destinations.

24.   Readers have asked about Ricky Williams T-shirts.

25.   Readers have asked that their names be removed from the mailing list.

26.   Readers often ask about having automotive students work on their vehicles as class projects.

27.   Readers often ask me to recommend products when they upgrade their computers.

28.   Readers frequently ask me for advice on how to start a club.

29.   Readers have asked how to help victims of malaria and other diseases common in areas with poor sanitation and hygiene.

30.   Readers often ask how they can invest, make money and not make the earth a dirtier or less humane place.