All of our TAs this quarter are graduate students whose area of study is similar; they thus are often required by their advisers to attend the same events and go to the same meetings. That has happened this quarter: each of our staff has adviser-required commitments on Fridays from 11 to noon and 3 to 4. So starting next Friday, there will be no TA on duty Fridays 11-noon or 3-4. TAs will, as now, be on duty the rest of the time the Help Center is open.