Enter the BBC Radio 4 podcast Uncharted, here to show you how numbers, graphs, maths and data plotting can be pivotal, the secret sauce behind some of the biggest scandals, historical watersheds ...

Revise straight line graphs for your maths GCSE foundation and higher exams with Bitesize interactive practice quizzes covering feedback and common errors.

The brain teaser is posted on Reddit. "Add one line to make the equation true (≠ is not the answer)," reads the caption shared along with it. "Add 1 line to make the equation true. 5+5+5+ 5 ...