[P4 Science - J1 Physics and up: Magnets & Electric Fields] Have you ever seen a magnet so strong that it slows objects down? Take this...

[P4 Science and up: Light & S3 Biology: Eye receptors] I like illusions, especially those that reveal surprising facts about our brains...

[S3 Biology and up: Cells] For many, many years, scientists struggled with the shape and structure of the cells within the body....