Hi Gordon,
One of the ways I have done it to to announce that I have just been approached by a person asking if I can provide a solution to a problem (I give details and specifics) that has to be solved in the next number of hours. (Can be 24-72,etc.) Then I ask for input and possible solutions. Sometimes I will break the class into groups and have them work on a part of the solution. Then we all get together at the end of the time and see what we have. It fun for the students and it… >>>