Students across Singapore have already returned to school and resumed classes normally after a brief period of home-based learning during circuit breaker. The rest of the world, however, might not ...

In The Overhead Projector: Don’t Overlook It (Part 1), I explained why it’s better to use a projector (be it an old-fashioned overhead or LCD) than to write on the board. Now we turn to how to use a ...

Placing a Plexiglas block on top of a mark on an overhead projector decreases the apparent depth of the mark. Turn on the projector and put the transparency on it. Focus the projector. Put the block ...