CERTIFICATES are happening - If you want certificates for your students, make sure you have generated a grade report. You can do this in the grade centre by clicking generate grade report.
HOLIDAY COMPETITION SUBMISSION is open, scroll to the very bottom of the competition page for more details.
Here is Dr Karl having a play with the Esplora at the Zero Robotics Final! trying to get values of the accelerometer to read exactly 0 in x and y! Leading to discussions on Electromagnetic noise / interference.